Water is a very important part in maintaining the existing structure of life on Earth as we know it. Depending upon which textbook you consult, the Earth consists of 70 to 75 % water. Whether we are talking salt water, marine environments or fresh water environments, water is one of the most important requirements in establishing a healthy, functioning habitat on Earth. Just look at the percentage of our bodies that is composed of water, roughly the same percentage as there is water on Earth. Water is so important, it is one of the substances scientists look for when they are trying to identify other planets in other solar systems that might possibly have life on them. From the dry, dusty desert regions to the lush, tropical rain forests of the Amazon, water and the amount of water contained therein constitute a required priority that can not be overlooked.