Cranfield University

The carbon cycle - Quiz

Answer each question below, then choose Check answers to see your score. You can reveal the correct responses after marking.

1 What is the carbon cycle?

The best way to win the 'Tour de France' The exchange of carbon between air, sea and land The reduction of greenhouse gases

2 What are the two main parts of the carbon cycle?

The front wheel and the back wheel! The geological and the biological cycles The above-ground and subterranean cycles

3 Over what timescale does the full geological carbon cycle operate?

Daily Annually Thousands of years Millions of years

4 Which of these rocks holds lots of (inorganic) carbon?

Granite and Flint Heavy metal Limestone and Chalk Basalt and Pumice

5 By which process to green plants remove CO2 from the air?

Photosynthesis Photography Photovoltaic Photo-booth

6 What do autotrophic organisms do?

Collect trophies and medals Turn the sun's rays into carbon Capture the CO2 in air, fixing the carbon Become green in colour

7 What human activity adds most carbon to the air?

Bicycling to school Walking in the countryside Going swimming Burning fossil fuels in cars and planes

8 Are soil carbon levels increasing or decreasing in upland areas (like moorland)?

Generally, carbon levels are increasing Generally, carbon levels are not changing Generally, carbon levels are decreasing

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