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XI. a) Look and read

b) Write a description of the cycle by joining the correct half-sentences:

1. When the sun radiates heat, a) until they reach high land.

2. As soon as the water vapour forms, b) rain is precipitated.

3. While rising, c) the water flows back to the sea

4. When the vapour cools, d) the vapour cools.

5. During condensation, e) it begins to rise.

6. The clouds then move towards land, f) clouds are formed.

7. When the clouds reach high land, g) it condenses.

8. As the temperature falls, h) sea water evaporates.

9. On being precipitated, i) the air temperature falls.

10. After being absorbed, j) The rain is absorbed by the soil.

XII. What word or group of words is substituted by the word that in the following sentences?

1. The temperature of a hot body is not the same as that of a cold one.

2. The pressure produced by compressed gas in a metal balloon standing in sunshine is greater than that in the shade.

3. The number of collisions of air molecules in a hot gas is greater than that of a cold gas.

4. The temperature of boiling water is 100 and that of melting ice 0°C.

5. The rate of expansion of a gas is greater than that of expansion of a liquid.

XIII. Rewrite these sentences in the Passive. The subjects of the passive sentences are underlined:

1. People store butane and propane in a liquid state.

2. We liquefy natural gas for convenience.

3. People store liquid petroleum gas (LP gas) in tanks and tank cars almost everywhere in the world.

4. People always equip such tanks and tank cars with the relief valves.

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