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6. which fossil fuel releases most carbon dioxide?

  • natural gas
  • coal
  • oil

7. where is carbon dioxide stored?

  • in a tank
  • underground
  • undee sea

8. what do fossil fuels release?

  • carbon dioxied
  • natural gas
  • sulfur dioxide

9. what problems do sulfur dioxide cause?

  • it contributes to global warming
  • it contributes to acid rain
  • it harms the ozone layer

10. is kinetic energy in wind renewable?

  • yes
  • no

11. why are uranium and plutonium used as nuclear fuels?

  • they are radioactive
  • they are metals
  • they release alot of heat when they burn

12. do renewable resources cost any money?

  • no
  • yes
  • maybe