PBS
Pbs Learning Media: Life's Little Essential: Liquid Water
Why is water necessary for life? Why is it the best and possibly only liquid to do the job? This illustrated essay from NOVA Online answers these questions, explaining why planetary scientists are on the lookout for water elsewhere in...
American Museum of Natural History
American Museum of Natural History: Water: H2 O = Life
This exhibition illuminates the concept of ecological balance and the challenge of managing the Earth's water supply. Its videos and images help explain just how important water is to sustaining life.