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Card 6
Front
How was oxygen added to the atmosphere?
Back
Card 7
Front
Name another way that carbon dioxide was removed from the atmosphere.
Back
Card 8
Front
How has human activity changed the atmosphere?
Back
Card 9
Front
How are pollutants directly harmful to humans?
Back
Card 10
Front
What is coal composed of?
Back
Card 11
Front
What are fossil fuels composed of?
Back
Card 12
Front
What happens when fuel burns?
Back
Card 13
Front
What is oxidation?
Back
Card 14
Front
What is reduction?
Back
Card 15
Front
Does fuel burn faster in air or in pure oxygen?
Back
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