1
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This is a mountain. When there's no man, it is transformed in water. When the water goes on the mountain, it forms a river. Sometimes, when there's a big hole in the floor, the water from the river forms a lake.

2
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This is a water well. You can take water for the underground. The underground water is formed for the water that goes down the clouds. And this water is accumulated in the land.

3
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The salt water. The salt water is three quarters of the water of the earth. And it is the water that you cannot drink.

4
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The sharks and fish live in seas and oceans. The sharks are killer animals.

5
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The ichthyosaurios live in the ocean a long time ago.