The Earth’s early atmosphere was different from that of the Earth’s atmosphere today.
The Earth’s early atmosphere was formed by
☐ | A | animals breathing. | |
☐ | B | global warming. | |
☐ | C | plants growing. | |
☐ | D | volcanic activity. |
Figure 1 shows some data about the composition of gases present in the Earth’s early atmosphere and today’s atmosphere.
composition (%) |
gas | Earth’s early atmosphere | today’s atmosphere |
nitrogen | 4 | 78 |
oxygen | <0.01 | 21 |
argon | <0.01 | 0.9 |
gas X | 95 | 0.04 |
ammonia | 0.5 | <0.001 |
sulfur dioxide | 0.5 | <0.001 |
Figure 1
Explain, using the data, the identity of gas X.
Figure 2 shows the concentration of carbon dioxide in the atmosphere above Hawaii from 1960 to 2010.
Figure 2
Use the graph to calculate the increase in the volume of carbon dioxide in 1m3 of atmosphere from 1960 to 2010.
(2)
increase in volume of carbon dioxide = .......... cm3
(2)
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