Global Warming |
1. All objects on Earth emit some EM radiation because they are warm. Hotter objects give out
- A. a higher principal frequency
- B. a lower range of frequencies
- C. a lower intensity of radiaiton
- D. a lower principal frequency
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2- 6. What are the missing words in the passage below?
| The Sun emits radiation, much of which can pass through the Earth's
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| When it hits the surface it is
, warming the Earth. As it gets warm it emits |
| radiation back outwards. However this radiation has a
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| This radiation is absorbed or
by gases such as carbon dioxide in the atmosphere. |
| This keeps the Earth warmer than it would otherwise be, and is called the
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7. Two other gases that cause global warming like carbon dioxide are
- A. methane and nitrogen
- B. nitrogen and oxygen
- C. methane and water vapour
- D. nitrogen and water vapour
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8. The carbon cycle can be used to explain why carbon dioxide iin the atmosphere has remained constant for thousands of years.
Carbon dioxide is released into the atmosphere by
- A. photosynthesis
- B. respiration
- C. perspiration
- D. evaporation
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9. Carbon dioxide is removed from the atmosphere by
- A. photosynthesis
- B. respiration
- C. perspiration
- D. evaporation
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10. The large increase in the amount of carbon dioxide in the last 50 years can be explained by
- A. more photosynthesis
- B. more respiration
- C. faster decay of plants and animals
- D. burning of fossil fuels
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11. Another major factor increasing the level of carbon dioxide is
- A. global warming
- B. the destruction of forests
- C. the over-mining of minerals
- D. increased water pollution
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12. One consequence of global warming is the risk of flooding by rising sea levels. Scientists think this will be caused by 2 factors. These are:
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Factor No. 1 |
Factor No. 2 |
| A |
Metling Sea Ice |
Expansion of Sea Water |
| B |
Metling Sea Ice |
Contraction of Sea Water |
| C |
Melting Continental Ice |
Expansion of Sea Water |
| D |
Melting Continental Ice |
Contraction of Sea Water |
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13. Which of the following is NOT an expected consequence of global warming?
- A. Cannot grow crops in some countries because of changes in the weather
- B. More water vapour in the atmosphere
- C. Not enough carbon dioxide for plants to survive
- D. More extreme weather events
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