Water is the most important substance on Earth. It covers 71% of the planet and is essential to all known forms of life. Its values range from the sustenance of human life to the sustenance of ecosystems and to sculpting our landscapes-shaping both the most basic natural and human-made processes.
Water is an absolute necessity for any living organism. The smallest bacterium and the largest mammal need water to survive. Indeed, human beings are about 60% water and are required for proper functioning of nearly every bodily system: to regulate body temperature, transport nutrients and oxygen, remove waste products, and lubricate joints.
Water is attributed with diversity in ecosystems. Rivers, lakes, and oceans as well as wetlands provide living space for thousands of species of animals and plants and microorganisms. Aquatic ecosystems are very important in the support of food chains, ensuring that life is prolonged in all its forms.
The Water Cycle: Earth's Natural System
Water is distributed throughout the world by this ever-moving process known as the water cycle, which is driven by sunlight energy. The water vapor cycle begins in oceans, rivers and lakes as it evaporates and assumes a vapour state to assist in the formation of clouds, which the clouds then distribute over the entire planet, returning it to the earth as precipitation…
