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2. What is ethanol produced from?

  • Microbial fermentation of sugar
  • Carbon dioxide heating up
  • Microbial fermentation of salt
  • Extraction of salt from the sea

3. What is wet scrubbing?

  • Cleaning something well
  • The removal of sulfur dioxide from flue gases before its emitted from power stations
  • Getting rid of carbon monoxide in power stations
  • Getting rid of nitric acid from flue gases before its emitted from power stations

4. What substance weathers limestone, damages trees and makes rivers and lakes acidic?

  • Salt
  • Heavy snow and rain
  • Acid rain
  • Wind

5. What are biofuels?

  • Fuels that are good for people to breathe in
  • Renewable types of fuels
  • Fuels produced from plant material
  • Fuel that has been biologically passed down from your parents
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