Test yourself
2 What does combustion mean?
4 What does non-renewable mean?
Hydroe
surrous
rivers
move
Sol
The
b) Name one other greenhouse gas.
8 a) What is global warming?
out running out
1 Where does most of the world's energy come from?
3 List five common fuels that could be used in the home.
5 We are running out of fossil fuels. Suggest three ways we can deal with this problem
6 What happens to the heat energy that reaches Earth from the Sun?
7 a) Explain why carbon dioxide is called a greenhouse gas.
enewable energy resources
Cause fossil fuels will eventually run out, scientists are developing other ways olgen
rgy. Energy sources that do not use fuels taken from the Earth are called all
gy sources. They use natural sources such as the Sun, tides, and wind. These
b) Explain how global warming can lead to the flooding of low-lying areas.
wable energy sources because they will be able to supply energy for million
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