The surface of our planet Earth is more than two thirds (72 percent) covered by water. We call small stretches of water seas and larger expanses oceans, but they are all part of one gigantic World Ocean that is moving and changingand affecting our livesall the time. Without seas and oceans, we would not survive. But where did all this water come from? What does it do? Why do we need it?The surface of our planet Earth is more than two thirds (72 percent) covered by water. We call small stretches of water seas and larger expanses oceans, but they are all part of one gigantic World Ocean that is moving and changingand affecting our livesall the time. Without seas and oceans, we would not survive. But where did all this water come from? What does it do? Why do we need it?
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