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The following is how rain is formed. The air is filled with tiny particles known as vapour. Vapour is actually the gaseous form of water. The air around us is constantly moving because the air near the surface of the Earth is hotter and lighter. This is why this air rises. The air higher up in the sky is cold and heavy, so it sinks. The rising of air and the sinking of cold water cause the air to move. When the hot of air rises to a certain level, the vapour presents in it, cools and changes to water. This is known as condensation. When the water particles are too heavy for the air to carry, the air is said to be oversaturated. The water particles then fall as rain.
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1. What is the purpose of the text ?
A. To show the form of rain.
B. To explain how rain is formed.
C. To show what rain looks like.
D. To explain what causes rain.
E. To describe rain.

2. What is vapour ?
A. A very tiny particle.
B. The gaseous form of water.
C. A part of gas.
D. The hot air.
E. A heavy particle of air.

3. When is the air called to be oversaturated ?
A. When the water particles falls as rain.
B. When the vapour changes into water.
C. When the water particles are too heavy for the air to carry.
D. When the hot air rises to a certain level.
E. When the air moves.

4. The air higher up in the sky is cold and heavy, so it sinks." The underlined word refers to ....
A. the air
B. the sky
C. the cold water
D. the rain
E. the surface​