Put a circle around the number next to each correct answer.
I. Why doesn't the air remain still? The reason is that air, when it becomes heated, becomes lighter, and it rises. When it rises, other air moves in to take its place. The temperature of air becomes like the surface of the earth over which it travels. Over dry land, the air can become very hot. Then, when the sun goes down, it cools off quickly. Over water the air heats up more slowly and cools off more slowly. These changes cause the movement of air, which we call wind..
A. This story is mainly about -
1. air over dry land.
2. the heating up of air.
3. how air becomes lighter.
4. why air moves.
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