The Carbon Cycle A-Level Geography CGP P12

The magnitude of carbon stores can be affected by natural and ................... interventions.

What type of natural events can alter the magnitude of the carbon store?

• 
• 
• 

Without human intervention carbon would remain sequestered in the ​ (a)   for thousands or millions of years.

• lithosphere
• atmosphere

Loss of vegetation ​ (a)   photosynthesis.

• decreases
• increases
• neutralises

Wildfires rapidly transfer large quantities of carbon from biomass (or soil) to the ......................

What happens to the levels of carbon in the atmosphere when photosynthesis decreases?

• With decreased photosynthesis less carbon is removed from the atmosphere and the levels of carbon fall

• With decreased photosynthesis less carbon is removed from the atmosphere and the levels of carbon rise

In the long term wildfires can encourage the growth of new plants, which take in ................... from the atmosphere through photosynthesis

• Nitrogen

• Hydrogen

• Carbon

Depending on the amount and type of regrowth fires can have a neutral effect on the amount of atmospheric carbon

• False

• True

Carbon stored within the Earth in ​ magma is released during ............... eruptions. The majority enters the atmosphere as carbon dioxide.

Recent volcanic eruptions have released much more carbon dioxide than human activities.

• True

• False