q2
6) There is less carbon dioxide in the Earth’s atmosphere now than there was in the Earth’s early atmosphere.
6.1) The amount of carbon dioxide in the Earth’s early atmosphere decreased because it was used by plants and algae for photosynthesis, dissolved in the oceans and formed fossil fuels.
Give one other way that the amount of carbon dioxide in the Earth’s early atmosphere decreased. [1 mark]
6.2) Carbon dioxide is a greenhouse gas. Describe the greenhouse effect. [4 marks]
6.1) The amount of carbon dioxide in the Earth’s early atmosphere decreased because it was used by plants and algae for photosynthesis, dissolved in the oceans and formed fossil fuels.
Give one other way that the amount of carbon dioxide in the Earth’s early atmosphere decreased. [1 mark]
6.2) Carbon dioxide is a greenhouse gas. Describe the greenhouse effect. [4 marks]
The graphs in Figure 10 show the concentration of carbon dioxide in the atmosphere and global average surface temperature since 1900.
6.3) Calculate the percentage increase in the concentration of carbon dioxide from 1975 to 2000. [1 mark]
6.3) Calculate the percentage increase in the concentration of carbon dioxide from 1975 to 2000. [1 mark]
____________________ %
6.4) What was the global average surface temperature in 1980? [1 mark]
Global average surface temperature = ________________ °C
6.5) A student stated: ‘The graphs show that increasing the concentration of carbon dioxide in the atmosphere causes global temperature increases.’
Discuss why this statement is only partially true. [4 marks]
(Total for Question 6 = 11 marks)
Discuss why this statement is only partially true. [4 marks]
(Total for Question 6 = 11 marks)