5.9.1.1 The Proportions of Different Gases in the Atmosphere

Question 1

For how long has the Earth’s atmosphere have similar proportions to current day?

Answer 1

• 200 million years

Question 2

Approximately how much of the Earth’s atmosphere is nitrogen?

Answer 2

• 80%
• 4/5

Question 3

Approximately how much of the Earth’s atmosphere is oxygen?

Answer 3

• 20%
• 1/5

Question 4

Approximately how much of the Earth’s atmosphere is carbon dioxide, water vapour and noble gases?

Answer 4

• small proportions