g25.    What are the properties of water?

Water covers about 71% of the earth.  Organisms are made up of from 60% to 90% water by weight. It exists as a liquid over a wide span of temperature. It changes temperature very slowly because of its capacity to store heat. It has a high heat of vaporization. It dissolves many substances. It has an extremely high surface tension. It expands when it freezes (and the fish are happy about that). Water is a renewable resource. 

e02.   Where is life found in the water?

e07.    What is the Wild and Scenic River System?

e14.    What are the basic components of life?

e17.    How do organisms use matter?

e18.    Does water recover from pollution?

e19.    What materials can cause water pollution?

m77.    How is water used? 

m78.    How do droughts and floods impact populations? 

m79.    Where are our water supplies? 

m80.    How can we protect our water supplies? 

m81.    How can we increase our water supplies? 

m82.    How can we conserve our water supplies?   

m84.    What do we need to feed the world? 

m85.    How can food production be increased?