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6. Roughly what percentage of incoming solar radiation is absorbed by the Earths surface?

  • 50
  • 60
  • 20
  • 40
  • 30

7. The infrared radiation that is emitted by the Earths surface is partly absorbed by what in the atmosphere?

  • The Sun
  • Gases
  • Clouds

8. Carbon Dioxide concentration is increased by human activities in what way?

  • Deforestation
  • The photochemical breakdown of NO2
  • Landfill sites
  • Aerosol propellants

9. Which ocean current changes causes a nutrient upwelling which causes algal blooms?

  • El Nino
  • La Nina
  • The North Atlantic Conveyer

10. A positive feedback mechanism is.......

  • A situation where an initial change causes a reaction that increases the original change
  • A situation where an initial change causes a reaction that reduces the original change