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C9: Quiz 1
C9: Quiz 1
1)
a) For how many years has the earth’s atmosphere been like it is today?
b) Roughly, what percentage of the earth’s atmosphere is nitrogen and what percentage is oxygen?
c) Name 2 other gases in the earth’s atmosphere.
2) Why is it hard for scientists to say for certain how the atmosphere on earth has evolved?
3) The level of nitrogen in the atmosphere has increased over time. Which activity produces nitrogen and why has the level of nitrogen increased over time?
4)
a) Which process has caused the level of oxygen in the atmosphere to increase?
b) Write the chemical word equation for this process.
5)
a) In the early atmosphere, which gas was the most common and what process produced this gas?
b) As the earth cooled, what happened to the water vapour in the atmosphere?
6) The concentration of carbon dioxide in the atmosphere has decreased over time. Give three reasons why the concentration of carbon dioxide has decreased over time.
7)
a) How is crude oil created?
b) How is coal created?
c) What is limestone made from?
a) For how many years has the earth’s atmosphere been like it is today?
b) Roughly, what percentage of the earth’s atmosphere is nitrogen and what percentage is oxygen?
c) Name 2 other gases in the earth’s atmosphere.
2) Why is it hard for scientists to say for certain how the atmosphere on earth has evolved?
3) The level of nitrogen in the atmosphere has increased over time. Which activity produces nitrogen and why has the level of nitrogen increased over time?
4)
a) Which process has caused the level of oxygen in the atmosphere to increase?
b) Write the chemical word equation for this process.
5)
a) In the early atmosphere, which gas was the most common and what process produced this gas?
b) As the earth cooled, what happened to the water vapour in the atmosphere?
6) The concentration of carbon dioxide in the atmosphere has decreased over time. Give three reasons why the concentration of carbon dioxide has decreased over time.
7)
a) How is crude oil created?
b) How is coal created?
c) What is limestone made from?