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1. Which two elements make up water? (lesson 20a)
2. What do you usually call water when it is a) solid b) gas? (20a)
3. What is the melting point of water? (20a)
4. What is the boiling point of water? (20a)
5. What is process called when energy from the Sun turns water in a gas? (20b)
6. How do clouds form? (20b)
7. How do the clouds formed over the sea move over the land? (20b)
8. In the water cycle how does water which falls as rain return to the sea? (20b)
9. What process is used to clean muddy water? (20b)
10. What affects the size and shape of clouds? (20c)
11. What are the 4 common types of cloud? (20c)
12. What is it called when a gas changes into a liquid? (20c)
13. Why do raindrops eventually fall from clouds? (20d)
14. Winds travel that over the sea pick up --------. (20d)
15. Why do we get plenty of rain in Britain? (20d)

ANSWERS

1. Hydrogen and oxygen.
2. Ice, stem.
3. 0⁰C.
4. 100⁰C.
5. Evaporation.
6. As water vapour rises it cools and condenses into tiny droplets.
7. They are blown by the wind.
8. Through rivers.
9. Filtration.
10. The height at which they form and the speed of teh wind.
11. Cumulus, cumulonimbus, cirrus, stratus.
12. Condensing.
13. As the tiny droplets join together they get heavy enough to fall.
14. Moisture.
15. Britain is surrounded by the sea.