Try to use your knowledge of water to fill in the blank spaces with appropriate words, which may be selected from the following scroll box. When you have finished, you can check your answers against the correct listing of words provided at the end of the section. Most fundamentally, water is essential for life . Every living organism on earth must have water in some form in order to survive.
Every living cell is composed primarily of water.
When space probes are dispatched to other planets in search of other life forms, they look for the presence to water to determine if life, as we know it, is possible there. Special Properties Water is a special chemical substance. In chemical terms, the water molecule is strongly dipolar. The small size of hydrogen atoms makes it possible for molecules of water to effectively bond together or chemically associate, particularly at lower temperatures. The chemistry of water leads to some very interesting, and important, physical properties.