Chemistry of the Atmosphere

Question 2

Compare the changes in the percentages of gases in the region labelled C. [2 marks]

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Got 1/2 marks in Easter holiday.

Answer 2

(the percentage of) carbon dioxide decreased
and (the percentage of) oxygen increased

the increase and decrease (in percentage) occur at the same / similar rate
allow the changes (in percentage) are the same / similar in the same period of time

Question 3

Natural gas is a fossil fuel.
Describe how deposits of natural gas were formed. [3 marks]

Answer 3

plankton (died)

and (the organisms) were covered by sediments

and subjected to high temperature and high pressure (over millions of years)