The Shape and Layers of the Planet Earth—for Kids

Updated on February 9, 2017
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Livingsta is a writer who writes about anything that fascinates, provokes or interests her, always putting forth her best effort and focus.

Introduction to Earth

Do you know where you live? With the hustle and bustle of everyday life, it is easy to forget that the human family lives on a small blue planet named Earth. All around us we see trees, animals, cars, buildings, farms, factories, stores, and other natural and man-made structures.

With all of these everyday familiar objects around us and with the vast sky above us, and the deep oceans beneath us, our home planet often feels quite large. Compared to us, it is very large. There is enough space for each of us, our families and friends, our pets, as well as trillions of other life forms to live and enjoy the various experiences of life.

While to us, the Earth appears to be a vast wilderness, compared to other objects in the Universe it is actually quite small, in fact, it is so small, that you could say it is tiny.

Earth, also known as theEarth or Terra. It is the third planet outward from the Sun. It is the largest of the solar system's terrestrial planets and the only planetary body that modern science confirms as harbouring life. The planet formed around 4.57 billion (4.57×109) years ago and shortly thereafter acquired its single natural satellite, the Moon. Its dominant species is the human (Homo sapiens).

Structure of Earth

Cross sectional view of the Earth
Cross sectional view of the Earth

Physical Characteristics of the Earth

Shape

The Earth is approximately a slightly oblate spheroid (ellipsoid having a shorter axis and two equal longer axes), with an average diameter of approximately 12,742 km. The maximum deviations from this are the highest point on Earth (Mount Everest, which is only 8,850 m) and the lowest (the bottom of the Mariana Trench, at 10,911 m below sea level). The mass of the Earth is approximately 6 x 1024 kg.

Structure

Geophysical studies have revealed that the Earth has several distinct layers. Each of these layers has its own properties. The outermost layer of the Earth is the crust. This comprises the continents and ocean basins. The crust has a variable thickness, being 35-70 km thick in the continents and 5-10 km thick in the ocean basins. The crust is composed mainly of alumino-silicates.

The next layer is the mantle, which is composed mainly of ferromagnesium silicates. It is about 2900 km thick and is separated into the upper and lower mantle. This is where most of the internal heat of the Earth is located. Large convective cells in the mantle circulate heat and may drive plate tectonic processes.

The last layer is the core, which is separated into the liquid outer core and the solid inner core. The outer core is 2300 km thick and the inner core is 1200 km thick. The outer core is composed mainly of a nickel-iron alloy, while the inner core is almost entirely composed of iron. Earth's magnetic field is believed to be controlled by the liquid outer core.

The Earth is separated into layers based on mechanical properties in addition to composition. The topmost layer is the lithosphere, which is comprised of the crust and solid portion of the upper mantle. The lithosphere is divided into many plates that move in relation to each other due to tectonic forces. The lithosphere essentially floats atop a semi-liquid layer known as the asthenosphere. This layer allows the solid lithosphere to move around since the asthenosphere is much weaker than the lithosphere.

Interior

The interior of Earth reaches temperatures of 5270 kelvins. The planet's internal heat was originally generated during its accretion, and since then additional heat has continued to be generated by the decay of radioactive elements such as uranium, thorium, and potassium. The heat flow from the interior to the surface is only 1/20,000 as great as the energy received from the Sun.

Structure

Earth's composition (by depth below the surface):

0 to 60 km - Lithosphere (locally varies 5-200 km)

0 to 35 km - Crust (locally varies 5-70 km)

35 to 2890 km - Mantle

100 to 700 km - Asthenosphere

2890 to 5100 km - Outer Core

5100 to 6378 km - Inner Core

Core of the earth

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Structure of the earthcore of earthInterior of the earth
Structure of the earth
Structure of the earth
core of earth
core of earth
Interior of the earth
Interior of the earth

The Core of the Earth

The average density of Earth is 5515 kg/m3, making it the densest planet in the Solar system. Since the average density of the surface material is only around 3000 kg/m3, we must conclude that denser materials exist within the core of the Earth.

The core is divided into two parts, a solid inner core with a radius of ~1250 km and a liquid outer core extending beyond it to a radius of ~3500 km. The inner core is generally believed to be solid and composed primarily of iron and some nickel. The outer core surrounds the inner core and is believed to be composed of liquid iron mixed with liquid nickel and trace amounts of lighter elements. It is generally believed that convection in the outer core, combined with stirring caused by the Earth's rotation gives rise to the Earth's magnetic field through a process described by the dynamo theory. The solid inner core is too hot to hold a permanent magnetic field but acts to stabilise the magnetic field generated by the liquid outer core.

The Mantle

Earth's mantle extends to a depth of 2890 km. It is largely composed of substances rich in iron and magnesium. The melting point of a substance depends on the pressure it is under. As there is intense and increasing pressure as one travels deeper into the mantle, the lower part of this region is thought solid while the upper mantle is semi-molten. Thus, the upper mantle can only flow very slowly.

Crust

The crust ranges from 5 to 70 km in depth. The thin parts are oceanic crust composed of dense iron magnesium silicate rocks and underlie the ocean basins. The thicker crust is continental crust which is less dense and composed of sodium potassium aluminium silicate rocks.

Biosphere

Earth is the only place where life is known to exist. The planet's life forms are sometimes said to form a "biosphere." The biosphere is divided into a number of biomes, inhabited by broadly similar flora and fauna. On land, biomes are separated primarily by latitude. Terrestrial biomes lying within the Arctic and Antarctic Circles are relatively barren of plant and animal life, while most of the more populous biomes lie near the Equator.

The Atmosphere and Its Layers

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Layers of the earth's atmosphereLayers of atmosphere
Layers of the earth's atmosphere
Layers of the earth's atmosphere
Layers of atmosphere
Layers of atmosphere

Atmosphere

Earth has a relatively thick atmosphere composed of 78% nitrogen, 21% oxygen, and 1% argon, plus traces of other gasses including carbon dioxide and water vapour. The atmosphere acts as a buffer between Earth and the Sun. The Earth's atmospheric composition is unstable and is maintained by the biosphere. Namely, the large amount of free diatomic oxygen is maintained through solar energy by the Earth's plants, and without the plants supplying it, the oxygen in the atmosphere will over geological timescales combine with material from the surface of the Earth.

The layers, troposphere, stratosphere, mesosphere, thermosphere, and the exosphere vary around the globe and in response to seasonal changes.

UV rays entering the ozone layer
UV rays entering the ozone layer

Troposphere

This is the layer of the atmosphere closest to the Earth's surface, extending up to about 10-15 km above the Earth's surface. It contains 75% of the atmosphere's mass. The troposphere is wider at the equator than at the poles. Temperature and pressure drops as you go higher up the troposphere.

Stratosphere

This layer lies directly above the troposphere and is about 35 km deep. It extends from about 15 to 50 km above the Earth's surface. The lower portion of the stratosphere has a nearly constant temperature with height but in the upper portion, the temperature increases with altitude because of absorption of sunlight by ozone. This temperature increase with altitude is the opposite of the situation in the troposphere.

The Ozone Layer: The stratosphere contains a thin layer of ozone which absorbs most of the harmful ultraviolet radiation from the Sun. The ozone layer is being depleted and is getting thinner over Europe, Asia, North American and Antarctica, "holes" are appearing in the ozone layer.

Mesosphere

Directly above the stratosphere, extending from 50 to 80 km above the Earth's surface, the mesosphere is a cold layer where the temperature generally decreases with increasing altitude. Here in the mesosphere, the atmosphere is very rarefied nevertheless thick enough to slow down meteors hurtling into the atmosphere, where they burn up, leaving fiery trails in the night sky.

Thermosphere

The thermosphere extends from 80 km above the Earth's surface to outer space. The temperature is hot and may be as high as thousands of degrees as the few molecules that are present in the thermosphere receive extraordinary large amounts of energy from the Sun. However, the thermosphere would actually feel very cold to us because of the probability that these few molecules will hit our skin and transfer enough energy to cause appreciable heat is extremely low.

Hydrosphere

Earth is the only planet in our solar system whose surface has liquid water. Water covers 71% of Earth's surface (97% of it being sea water and 3% fresh water (http://earthobservatory.nasa.gov/Library/Water/) and divides it into five oceans and seven continents. Earth's solar orbit, gravity, greenhouse effect, magnetic field and oxygen-rich atmosphere seem to combine to make Earth a water planet.

Earth is actually beyond the outer edge of the orbits which would be warm enough to form liquid water. Without some form of a greenhouse effect, Earth's water would freeze.

On other planets, such as Venus, gaseous water is destroyed by solar ultraviolet radiation, and the hydrogen is ionized and blown away by the solar wind. This effect is slow but inexorable. This is one hypothesis explains why Venus has no water. Without hydrogen, the oxygen interacts with the surface and is bound up in solid minerals.

In the Earth's atmosphere, a tenuous layer of ozone within the stratosphere absorbs most of this energetic ultraviolet radiation high in the atmosphere, reducing the cracking effect. The ozone, too, can only be produced in an atmosphere with a large amount of free diatomic oxygen, and so also is dependent on the biosphere. The magnetosphere also shields the ionosphere from direct scouring by the solar wind.

The total mass of the hydrosphere is about 1.4 × 1021 kg, ca. 0.023 % of the Earth's total mass

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Earth in the Solar System

It takes Earth 23 hours, 56 minutes and 4.091 seconds to rotate around the axis connecting the north pole and the south pole. Earth orbits the Sun every 365.2564 mean solar days. Earth has one natural satellite, the Moon, which orbits around Earth every 27 1/3 days.

The orbital and axial planes are not precisely aligned: Earth's axis is tilted some 23.5 degrees against the Earth-Sun plane (which causes the seasons), and the Earth-Moon plane is tilted about 5 degrees against the Earth-Sun plane (otherwise there would be an eclipse every month).

Earth in the Solar System

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Planets of our solar systemsize comparison between earth and sun and other planetsOrbits of all the planets around the sun
Planets of our solar system
Planets of our solar system
size comparison between earth and sun and other planets
size comparison between earth and sun and other planets
Orbits of all the planets around the sun
Orbits of all the planets around the sun

The Moon

Luna, or simply 'the Moon', is a relatively large terrestrial planet-like satellite, about one-quarter of Earth's diameter(3,474 kms). The natural satellites orbiting other planets are called "moons", after Earth's Moon.

While there are only two basic types of regions on the Moon's surface, there are many interesting surface features such as craters, mountain ranges, riles, and lava plains. The structure of the Moon's interior is more difficult to study. The Moon's top layer is a rocky solid, perhaps 800 km thick. Beneath this layer is a partially molten zone. Although it is not known for certain, many lunar geologists believe the Moon may have a small iron core, even though the Moon has no magnetic field. By studying the Moon's surface and interior, geologists can learn about the Moon's geological history and its formation.

The footprints left by Apollo astronauts will last for centuries because there is no wind on the Moon. The Moon does not possess any atmosphere, so there is no weather as we are used to on Earth. Because there is no atmosphere to trap heat, the temperatures on the Moon are extreme, ranging from 100° C at noon to -173° C at night.

The Moon doesn't produce its own light but looks bright because it reflects light from the Sun. Think of the Sun as a light bulb, and the Moon as a mirror, reflecting light from the light bulb. The lunar phase changes as the Moon orbits the Earth and different portions of its surface are illuminated by the Sun.

The gravitational attraction between the Earth and Moon cause the tides on Earth. The same effect on the Moon has led to its tidal locking: its rotation period is the same as the time it takes to orbit the Earth. As a result, it always presents the same face to the planet.

The Moon is just far enough away to have, when seen from Earth, very nearly the same apparent angular size as the Sun (the Sun is 400 times larger, but the Moon is 400 times closer). This allows total eclipses as well as annular eclipses to occur on Earth. Here is a diagram showing the relative sizes of the Earth and the Moon and the distance between the two.

The Moon

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Comparison between earth and moonFull MoonMoonPhases of the moon
Comparison between earth and moon
Comparison between earth and moon
Full Moon
Full Moon
Moon
Moon
Phases of the moon
Phases of the moon

Biggest Geographic Subdivision

Area

Total: 510.073 million km2

Land: 148.94 million km2

Water: 361.132 million km2

Note: 70.8 % of the world's surface is covered by water, 29.2 % is exposed land

Land boundaries: the land boundaries in the world total 251,480 km (not counting shared boundaries twice)

Coastline: 356,000 km

Climate

Two large areas of polar climates separated by two rather narrow temperate zones from a wide equatorial band of tropical to subtropical climates. Precipitation patterns vary widely, ranging from several metres of water per year to less than a millimetre.

The climate where you live is called regional climate. It is the average weather in a place over more than thirty years. To describe the regional climate of a place, people often tell what the temperatures are like over the seasons, how windy it is, and how much rain or snow falls. The climate of a regional depends on many factors including the amount of sunlight it receives, its height above sea level, the shape of the land, and how close it is to oceans. Since the equator receives more sunlight than the poles, climate varies depending on the distance from the equator.

However, we can also think about the climate of an entire planet. Global climate is a description of the climate of a planet as a whole, with all the regional differences averaged. Overall, global climate depends on the amount of energy received by the Sun and the amount of energy that is trapped in the system. These amounts are different for different planets. Scientists who study Earth's climate and climate change study the factors that affect the climate of our whole planet.

While the weather can change in just a few hours, climate changes over longer timeframes. Our Earth is warming more quickly than it has in the past according to the research of scientists. Hot summer days may be quite typical of climates in many regions of the world, but global warming is causing Earth's average global temperature to increase. The amount of solar radiation, the chemistry of the atmosphere, clouds, and the biosphere all affect Earth's climate.

Click thumbnail to view full-size
Greenhouse effectFactors that affect climate
Greenhouse effect
Greenhouse effect
Factors that affect climate
Factors that affect climate

Natural and Environmental Hazards

Large areas are subject to extreme weather such as tropical cyclones, hurricanes, or typhoons that dominate life in those areas. Many places are subject to earthquakes, landslides, tsunamis, volcanic eruptions, tornadoes, sinkholes, blizzards, floods, droughts, and other calamities and disasters.

Many localized areas are subject to human-made pollution of the air and water, acid rain and toxic substances, loss of vegetation, loss of wildlife, species extinction, soil degradation, soil depletion, erosion, and an introduction of invasive species.

A scientific consensus exists linking human activities to global warming due to industrial carbon dioxide emissions. This is predicted to produce changes such as the melting of glaciers and ice sheets, more extreme temperature ranges, significant changes in weather conditions and a global rise in average sea levels.

In General

Modern geologists and geophysicists accept that the age of the Earth is around 4.54 billion years (4.54 × 109 years ± 1%). This age has been determined by radiometric age dating of meteorite material and is consistent with the ages of the oldest-known terrestrial and lunar samples.

Following the scientific revolution and the development of radiometric age dating, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old. The oldest such minerals analyzed to date, small crystals of zircon from the JackHills of Western Australia, are at least 4.404 billion years old. Comparing the mass and luminosity of the Sun to the multitudes of other stars, it appears that the solar system cannot be much older than those rocks. Ca-Al-rich inclusions (inclusions rich in calcium and aluminium), the oldest known solid constituents within meteorites that are formed within the solar system, are 4.567 billion years old, giving an age for the solar system and an upper limit for the age of Earth. It is hypothesized that the accretion of Earth began soon after the formation of the Ca-Al-rich inclusions and the meteorites. Because the exact accretion time of Earth is not yet known, and the predictions from different accretion models range from a few million up to about 100 million years, the exact age of Earth is difficult to determine. It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages. The Acasta Gneiss of Northern Canada may be the oldest known exposed crustal rock.

Questions & Answers

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      • livingsta profile imageAUTHOR

        livingsta 

        2 years ago from United Kingdom

        Hello Fred, thank you! :)

      • livingsta profile imageAUTHOR

        livingsta 

        2 years ago from United Kingdom

        Hello Burritokiteh, thank you, glad that you found this helpful! :)

      • livingsta profile imageAUTHOR

        livingsta 

        2 years ago from United Kingdom

        Hello Cat, so true. Thank you for passing by! :)

      • livingsta profile imageAUTHOR

        livingsta 

        2 years ago from United Kingdom

        Hello PP, I am glad that this was helpful. All the best! :)

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        burritokiteh 

        4 years ago

        this is amazing

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        4 years ago

        this was very helpfol

      • profile image

        burritokiteh 

        4 years ago

        this is awesome

      • profile image

        fred 

        4 years ago

        this is the best website ever

      • profile image

        H20 Delirios 

        4 years ago

        This isn't helpful

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        burritokiteh 

        4 years ago

        thanks for this

      • profile image

        fred 

        4 years ago

        yo

        this is good

      • profile image

        burritokiteh 

        4 years ago

        this is helpful

      • profile image

        Cat 

        4 years ago

        This would be purrfect for kids.

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        student 

        4 years ago

        hello im doing a science fair project and im making a bibliography i need to know...when was this page publish & what is the name of the author who wrote this? (cause i cant put down livingsta)

      • profile image

        pp 

        5 years ago

        it was very useful for me in the project

      • livingsta profile imageAUTHOR

        livingsta 

        5 years ago from United Kingdom

        Hi Princess thank you, I am glad that you find this interesting and informative!

      • profile image

        princess 

        5 years ago

        this site is interesting and imformitive.

      • profile image

        jce 

        5 years ago

        this web sight is awesome

      • profile image

        Chaunda Peters 

        5 years ago

        I Love This website ty so much

      • livingsta profile imageAUTHOR

        livingsta 

        5 years ago from United Kingdom

        Hi Anon, you're welcome. Glad it was helpful!

      • profile image

        Anon 

        5 years ago

        Thanks for this,

        really helped me!

      • livingsta profile imageAUTHOR

        livingsta 

        5 years ago from United Kingdom

        Thank you Miss Cool, I am glad it helped!

      • profile image

        miss cool 

        5 years ago

        this was really useful for my hwk thx!!

      • livingsta profile imageAUTHOR

        livingsta 

        5 years ago from United Kingdom

        Thank you!

      • profile image

        a guy XD 

        5 years ago

        i lov this thing!

      • livingsta profile imageAUTHOR

        livingsta 

        5 years ago from United Kingdom

        Thank you @cat!

      • profile image

        cat 

        5 years ago

        this is awesome!!!!!!

      • livingsta profile imageAUTHOR

        livingsta 

        5 years ago from United Kingdom

        Thank you Sanchari Bhattacharjee. Glad it was useful!

      • profile image

        sanchari bhattacharjee 

        5 years ago

        very cool,awesome,good,informative and all the good things we can say

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Thank you Er!

      • profile image

        er 

        6 years ago

        lovr it

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        @Chris

        Lon L. Hood of the University of Arizona in Tucson and collaborators says "We knew that the moon's core was small, but we didn't know it was this small," Hood said. "This really does add weight to the idea that the moon's origin is unique, unlike any other terrestrial body -- Earth, Venus, Mars or Mercury," Hood said. "The simplest hypothesis, and the most popular now, is that a Mars-sized object collided with Earth after Earth had differentiated into a core and mantle. The impact generated a vapor cloud, which was mostly composed of silicate, and that became the moon."

        Source: http://www.spacedaily.com/news/water-99l.html

        Also please read the article below, hope this helps !!

        http://www.psrd.hawaii.edu/Sept99/PSRD-MoonCore.pd...

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Thank you Reena :)

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        @S.C, thank you, I am glad it helped

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        @Bob, thank you :)

      • profile image

        S.C 

        6 years ago

        i loved your information!!!!!!!!!!!!!!!it was very helpful to my homework^^thanks a lot~~

      • profile image

        Himanshu 

        6 years ago

        vvvvvvvvvv nice collections

      • profile image

        chris 

        6 years ago

        i need to know why the moon's iron core is so small compared to earth's and nothing about that is stated

      • profile image

        bob 

        6 years ago

        this site is cool

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Hi Azia, thank you so much !

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Thank you for the appreciation JP, am glad it is useful ! :-)

      • profile image

        azia f 

        6 years ago

        this is the best infor mation ever in my life . p.s hi

      • profile image

        JP 

        6 years ago

        Livingsta, I found your writing amazing and helpful. I hope its that way with everyone else too.

        Ps. how old are you? I think your very cute. I go to Chaparral High School in America. My name is Jackson Stone

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Great...am glad it helped !

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Thank you for the encouragement Anuradha ! Will write more soon !

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Great, I am glad it was useful !

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        I am pleased it was helpful Keymary!

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Thank you Wacko!

      • livingsta profile imageAUTHOR

        livingsta 

        6 years ago from United Kingdom

        Thank you Pinky !

      • profile image

        smartypants 

        6 years ago

        11 years old in the fith grade, i got a lot of usful info, thanks

      • profile image

        anuradha 

        6 years ago

        it is awesome i loved it

        because i love to know about the universe and

        our solar system pls give some more information like thi only thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!

      • profile image

        Amber 

        6 years ago

        I'm 11 and Im in 6th grade and i'm using this 4 a project

      • profile image

        keymary 

        6 years ago

        i read all of this and it was great i am happy i read this because it gives me enough information for my project im only 11 years old in the 5th grade thankyou for all the information

      • profile image

        wacko 

        8 years ago

        amazing :D

      • profile image

        pinky 

        8 years ago

        yes that's very good but i didn't read but i read all of them's comment and i am a 9 years old kid

      • livingsta profile imageAUTHOR

        livingsta 

        8 years ago from United Kingdom

        Sorry that it was a waste of time for you. But anyway, thank you for passing by and reading

      • profile image

        samad 

        8 years ago

        all was good for me but waste of time for ms livingsta

      • livingsta profile imageAUTHOR

        livingsta 

        8 years ago from United Kingdom

        Thank you very much PWalker, Yes indeed I was a teacher.

      • profile image

        PWalker281 

        8 years ago

        Love your hubs for kids. They are informative, well illustrated and well written. Were you a teacher in another life?

      • livingsta profile imageAUTHOR

        livingsta 

        9 years ago from United Kingdom

        Thank you Catherine..yea sure ...the kids will benefit..

      • Catherine R profile image

        Catherine R 

        9 years ago from Melbourne, Australia

        This is a really nicely put together hub and your pictures are great. Will bookmark this for my kids. Thanks

      • profile image

        Reena 

        9 years ago

        hi, i like you this hub it good stuff for kids to learn.

        thanks you

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