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What do you, the trees and animals have in common(共同点)? You all 1． water. Water is the “life blood” of our earth. It is in every living thing. Without water, your body would stop 2．. It is in the air. It runs through 3． and valleys. It forms lakes and oceans. Water is everywhere.

Nature has a great water system. Rainwater finds its way to 4． and rivers. Rivers lead to the oceans. At the mouths of the rivers, fresh water joins the salt water of the oceans. Here at the mouth of a river there is much important plant and animal life. However 5． destroys the life, so we have to clean our streams and rivers. Man has to work 6． nature-not against it.