Unit 2: The Atmosphere - Gases in the Atmosphere
- Created by: rosieevie
- Created on: 01-11-13 21:44
Other questions in this quiz
2. What percentage, on average, of the air is nitrogen?
- 57%
- 78%
- 76%
- 21%
3. Why do carbon dioxide levels rise at night?
- Plants photosynthesise less
- Increased burning of fossil fuels
- Plants don't photosynthesise
- Humans breathe more
4. Why does the rate of photosynthesis increase in the summer?
- Shorter day hours and decreased rainfall
- Shorter day hours and hotter weather
- Longer day hours and hotter weather
- Longer day hours and increased rainfall
5. Why has the percentage of hydrogen decreased from the early atmosphere to now?
- It's escaped from the atompshere
- It dissolved in oceans and rivers
- It has been trapped underground
- Human activity
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