write about the importance of water for sustenance of life on the earth (at least 200 words)
Answers
Water is one of the natures precious gifts to mankind. All living things consist mostly of water eg. the human body is of two thirds of water. It is clear, colourless liquid that appears blue when viewed through a thickness of 20 ft. The colour reflects not only from physical causes but also from suspended impurities. The freezing point of water is 0degree centigrade and its boiling point is 100 degree centigrade.
Water is the most essential component of life and is vital for sustenance. The importance of water in our diet is apparent as it helps the body to perform specific metabolic tasks and regulates our body temperature, moreover water is unique as it's density is similar to that of cell protoplasm. There is no doubt that water is everywhere and it is very important to our Earth and the life inhabiting it. Water contains no calories and is a significant factor in losing weight. It is the key component in determining the quality of our lives and is a universal solvent.
We should teach children to turn off faucets tightly after use, adjust sprinklers to water your lawn. Plant in the fall when conditions are cooler and collect water used for rinsing fruits and vegetables to water house plants, wash your pets outdoors in an area of your lawn that needs water and repair leaking pipes, harvest rain water. People use up our planets fresh water faster than it can naturally be replenished so, save water for the Earth, family and community. Cultural views of water are based on predominent religious views, like the Ganges river in Hinduism. Water is known as the elixir of life. So Conserve water to save life.
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Water is a dynamic medium, continually changing from liquid, to solid, to gas.It provides life for an entire planet. The total amount of water on the earth and in the atmosphere has been calculated to be between 1.3 and 1.4 billion km3. Three quarters of the surface of the earth is covered by oceans, comprising 97.2% of the total water volume on earth. only a small percentage is actually available for our use.
On a smaller scale, but in a similar manner, water circulates through all living organisms: plants, animals and human beings, and they all utilize water for very important and specific reasons. In the living organism, water delivers nutrients and oxygen and discharges metabolic wastes.As human beings, we can actually survive for many days even weeks without food, but if we go without water for even just three or four days, we will suffer some very dire consequences. When water is lacking, even slightly, all types of illnesses can occur.
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.
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.
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.
Directly or indirectly, water affects all facets of life. Without it, there would be no vegetation on land, no oxygen for animals to breathe and the planet would look entirely different than it does today.Without water there would be no dispersal of nutrients, electrical messages, or mass transit of goods and services that help life prosper.