Question
The energy we use comes from a variety of sources.
Fig. 5.1 shows the percentage of each source of energy used in one country in 2011.
(a) Coal, natural gas and oil are types of fossil fuel.
Calculate the total percentage of energy in Fig. 5.1 that came from fossil fuels.
…………………………………………% [1]
(b) Explain why fossil fuels are not sustainable resources.
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………..[1]
(c) Combustion of fossil fuels releases carbon dioxide into the atmosphere.
(i) State the name of two other processes that release carbon dioxide into the atmosphere.
1 ……………………………………………………………………………………………………………………….
2 ……………………………………………………………………………………………………………………….
[2]
(ii) State the name of one process that removes carbon dioxide from the atmosphere.
………………………………………………………………………………………………………………………[1]
(d) Describe the effects on the environment of increasing carbon dioxide concentration in the
atmosphere.
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………..[2]
(e) Improvements in food production have allowed human populations to increase.
Describe how modern technology has increased the production of crop plants.
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………..[3]
Answer/Explanation
Ans:
