Biogeochemical cycles
Answers are for parents and teachers.
1
CO2 is 0.04 % (4/10000) of air. How many litres of CO2 are in 500000 litres of air?
200
2
Write four stages of the nitrogen cycle in order.
Nitrogen fixation → ammonification → nitrification → denitrification.
3
12 g of carbon corresponds to 44 g of CO2. How many g of carbon are in 88 g of CO2?
24
4
Why is the phosphorus cycle slower than the nitrogen cycle?
Phosphorus has no gas phase and moves slowly through rocks and sediments.
5
Write two ways to reduce the rise in CO2.
Save fuel and use renewable energy; plant more forests.