Why Water Is Important to Life
We know how important water is to human life and also, because of agriculture, how important it is to plant life. But what about the earth in general? How important is water to the ecological balance of the earth? What role does it play and what would happen if we were to lose it or it didn't exist?
There are already parts of the world where we can see how life would change, if there were no water. We can also see it somewhat from satellite photos of Mars, the moon, and other "dead" space bodies. And we can extrapolate from the properties of water, itself, and what we know of its effect on life.
Water is a constant reminder that life repeats. It's the only element that has a visible cycle.
Earth Without Water
Imagine earth without water. The soil, with no water in it and nothing growing on it, would be lifeless, dead, collapsed into dust, sand, clay or rock. In California's Central Valley where agriculture predominates and pulls water from the ground, this process is already beginning to happen. The earth used to be like a sponge, but where the groundwater has been sucked almost dry, like the Central Valley, the earth has collapsed and hardened. This is the process we call "subsidence."
Earth Would Look Like This:
Now imagine the air without water. Clouds provide a buffer from the heating power of the sun. Without them it would pour down with no mercy. Dry air would suck out whatever moisture it could find, wherever it could find it, and the noses and soft tissues of any being that lived would shrivel. There would be no sweet scents, since moisture is what conveys smells.
The composition of the air would change too. All the methane currently stored in ice, bogs, and the ocean, would be released, thereby increasing the heating effect of the sun. The dust in the air would be blown hither and yon, with nothing to wash it down. Temperatures would swing from extreme to extreme, getting hotter as time went on.
The ground, because it would be rock, sand, or dry earth would have nothing in or on it to blunt the heat. The sun, pouring down without mitigation, would beat on the earth and heat it up. Any carbon-based thing would burn up during the day. At night it would freeze.
There would be nothing to soften the effect of volcanoes or to put out fires. There would be no cushioning effect against earthquakes. Any rubbing of tectonic plates against each other would be magnified far beyond what it is now - the trembling would create massive rock slides and crumbling both at the site and in remote areas affected. The surface of the earth would burn and grind itself into dust. Am I exaggerating? Most likely not. The article below talks about earthquakes and the softening effect of water underground.
The Hydrologic Cycle
Water is a life giver - even a life creator. It lies at the basis of our understanding of how life works. It also lies at the basis of how we understand our own personal lives. Of the four (or five) basic building blocks of life, water is the only one with a visible cycle, which we call the hydrologic cycle. Fire has no cycle that we can see, neither do earth or air. And we don't understand spirit (the ether) enough to know if it does or not. Water is a constant reminder that life repeats.
The hydrologic cycle works as follows: From it's most usable state, water evaporates and joins the air as water vapor. When the air cools, the vapor condenses and creates clouds, which help block heat from the sun. Colonies of the ice-nucleating bacterium, P. syringae, blown into the clouds by wind, help them to precipitate and fall as rain, snow, or hail. Much of the precipitation is stored on land as groundwater and lakes, snow and ice. From there water flows to the sea, where it joins the "primordial soup" again as ocean, ready to start the cycle anew.
The Cycle of Life
All of life, as we know it, cycles and recycles. From physical life to death and the breakdown of the body, to re-entry into Spirit. Then to the thought of life in a new body, to actual birth and living a new life through to death again - and on and on. Our own creations also follow the cycle of life: From the birth of a product through its use to its death, then its breakdown into physical components, then new ideas for new creations and the reuse of components in new products.
To water, were it sentient, it might seem that humans were its children, since we are so dependent upon it for survival. But humans don't conceive of ourselves as subordinate to anything anymore. Instead, we treat water as our servant - as an element of the earth that we "control." We use water to master life, feed ourselves, and to create our own subordinate products.
Here are some of the "services" that we see water provide - that produce the abundance of life we see around us every day, and that we are trying to control for our own benefit and protection.
Water cools the earth when it heats up and warms it when it cools down. When the temperature drops low enough, water freezes, releasing its own heat and warming the frigid air. When the temperature rises high enough, water evaporates, taking some of the heat with it and cooling the hot air. It also cools the heat of volcanoes and wildfires, via moisture released from burning vegetation, which forms clouds that cool the air and then release rain. And water in the ground cools the surface of the earth during the day and warms it at night.
Without water the air and earth would vacillate between extreme hot and extreme cold every day, everywhere, with a gradual increase in temperature as time goes on.
Cushions & Softens
Just as water in a waterbed has a cushioning effect with any movement, so it also has when buried in the earth. This cushioning is good protection during an earthquake, proven in seismic studies, when the groundwater slows down seismic waves and dampens their effects.
Water also softens the soil, making it easier for rain to percolate through to refill the aquifer - the earth's underground storage space. When stored groundwater is sucked up and not replaced, the soil gradually condenses and becomes hard. Then water slides off the top, instead of being absorbed, and the earth loses its storage place and its shock protector.
The softening effect of water is also evident in the way it prepares seeds to grow. Many seeds have hard covers that keep them from growing until water is present. Water softens the seed cover enough for the little shoots to break out, then the soft soil, mixed with organic matter, provides a perfect medium for the shoots to grow into full-fledged plants.
Without water most seeds would be too hard to grow, and the ground would be too hard or sandy to absorb and hold rain. Without water storage, droughts would kill, and earthquakes would be severe.
Throughout the earth and the bodies of living things, water is used to transport both nutrients and wastes. On land, water transports nutrients and rich soils from the mountains to lower altitudes on the way to the sea. In the ocean, water currents disperse nutrients throughout the world.
Humans use waterways to transport goods via boats and barges. Water in plant sap and blood transports nutrients and wastes to and from cells. In the human and animal brain water transports electrical charges, which allow us to think clearly.
Without water there would be no dispersal of nutrients, electrical messages, or mass transit of goods and services that help life prosper.
Cleanses and Breaks Down Wastes
Rain cleans whatever it passes through (air, the earth's surface, soil), which is why everything smells fresh after a rain. It also plays a cleansing role in our own bodies, as it passes through the kidneys. It carries down dirt, debris, minerals, and toxins, washing all into the sea. Once in the ocean, algae and other microbes break the debris down (except plastic) into basic food components that can be used to support life. The ocean thereby becomes a primordial soup, filled with nutrients of all kinds. From the ocean life was born.
Without water the earth and our bodies would be unable to break down wastes.
Water is a key component of birth - the reproductive cycle of all animals mimicking the life-spawning ocean. In mammals, sperm are carried by water to impregnate the egg. Once impregnated, all nutrients in a female's body that a baby will need are carried by water (amniotic fluid) to the womb, before leftovers are distributed to the mother. Babies are born with a gush of water and are immediately fed with water that is nutrient rich. Birds produce eggs that are mostly water mixed with nutrients for the growing life inside.
Without water there would be no reproduction, hence continuation of life as we know it.
Provides a Home
In addition to being the soup from which life emerged, the ocean and other water bodies act as home for more life than what lives on land. Mammals, fish, birds, insects, trees, plants, algae, krill, and many other forms of life either live directly in water or are wholly dependent upon it for survival. This includes the tiny iceworms, copepods, and diatoms that inhabit trillions of minuscule tunnels in icebergs and their undersides, providing food for whales and fish that migrate to the poles to eat.
Without water life would lose its primary food source.
Helps Make Things
Water and carbon dioxide are the two key components of plant photosynthesis, which is how plants make their food. Bees use water to make honey, flowers use water to make nectar, trees use water to make pitch, spiders and snakes use water to make venom, and termites mix saliva with mud to make their homes.
Humans use water to make paint, dyes, inks, all kinds of drinks, and we bottle it straight. We use it for paper, fabrics, food processing, chemical compounds, and the manufacture of hundreds of other products essential to modern living.
Without water, plants and many insects and arthropods could not survive, nor would humans have developed the foods and industries we have.
Caring About Water
To humans, as creators of our own lives, water is our servant. We use it to grow crops and livestock, to cleanse and keep ourselves healthy, to stimulate ideas for products, and to transport those products. We use its cycles to helps us understand ourselves and to remind us that our own lives also work in cycles.
But if we abuse water, like masters have a tendency to do with servants, if we don't care for it and preserve it, we will end up destroying ourselves. We need the rain forests, the swamplands, the open rivers and lakes, the estuaries, icebergs, snow tops - water in all its natural forms we need. And so does the rest of life.
If, instead of commanding it, we could conceive of ourselves as a partner or an intelligent component of water's own rain and storage cycle, it might encourage us to be more respectful of what water can do and more careful of the way we utilize it.
With water, we thrive. Without water, there is no life. We must learn to value, conserve, and take care of the water we have.
Questions & Answers
I need to write a five paragraph essay on why water is important to human existence. Where should I start?
You're a human. Why is water important to you? If there was no water anywhere at all, would you or your friends exist? How, or why not?
After you've answered the questions above, take each of your answers and explain what you mean in two or three sentences. Each answer with its explanation will be one paragraph. (Then, you'll have to choose the best ones, because this method should give you more than five paragraphs.)
I need to write a paragraph on why water is important. Where should I start?
One paragraph? There's not enough room in one paragraph to write much, so you'll need start by choosing what aspect of water you want to focus on––how it feeds life, how it helps the earth, or perhaps you could borrow something from here:
I'm doing research on why we need to drink water. Can you pls give me some water characteristics?
I've written an article on the roles water plays in keeping our bodies healthy. This may provide you with the answers you seek. Let me know if you still have questions after you read it:
I'm doing research on why we have to drink water. What are some characteristics of water?
I've provided a link to an article on why our bodies need water in my answer to another question. Here's one on how to drink more water that also might have some answers for you.
Where should I start if I want to write a report on water coolers?
Do a search on DenGarden.com for "water cooler." DenGarden is a Hubpages affiliate site for all articles about homes, inside and out. All the articles are vetted and are high quality. I have many articles on that site about fixtures that use water (like dishwashers, showers, irrigation systems, etc.), but not one about water coolers. Others do, though.