Revision: 2.3 Biogeochemical cycles
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1
What is a biogeochemical cycle?
The movement and recycling of chemical elements between organisms and the non-living environment
2
Name two carbon stores
Any two of living biomass, soil, oceans, the atmosphere, fossil fuels or carbonate rocks
3
What is a carbon sink?
A system that takes in more carbon than it releases over a given period
4
What is a carbon source?
A system or process that releases more carbon than it takes in over a given period
5
Which process takes carbon dioxide from the atmosphere into plant biomass?
Photosynthesis
6
How does feeding move carbon through an ecosystem?
Carbon in the food is transferred from the organism eaten to the consumer
7
How does burning fossil fuels affect atmospheric carbon dioxide?
It releases stored carbon as carbon dioxide, increasing atmospheric carbon dioxide
8
What is the residence time of carbon in a store?
The average time a carbon atom remains in that store before leaving it
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