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Card 6
Front
How did plants help produce more oxygen for the atmosphere?
Back
Card 7
Front
What happens to the carbon when plants die?
Back
Card 8
Front
what happened to the simple organisms when more oxygen built up in the atmosphere?
Back
Card 9
Front
Name the gasses that make up the atmosphere and there percentages?
Back
Card 10
Front
What is a pollutant?
Back
Card 11
Front
What is the difference between pollutant gasses that are directly harmful and indirectly harmful?
Back
Card 12
Front
What happens during a chemical reaction?
Back
Card 13
Front
What elements do the majority of fuel contain?
Back
Card 14
Front
What is a hydrocarbon?
Back
Card 15
Front
What is the only difference between different types of fuel? (Petrol and diesel)
Back
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