C1 Facts

?
What percentage is N2 in the atmosphere?
78%
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What percentage is O2 in the atmosphere?
21%
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How long ago did Earth's atmosphere form?
4 billion years ago
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How long ago did simple creatures form on Earth?
3 billion years ago
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How is CO2 measured in the air?
ppm
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What is oxidation?
when oxygen is added to a substance
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What is reduction?
when oxygen is removed from a substance
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What is combustion (burning)
an oxidation reaction
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Card 2

Front

What percentage is O2 in the atmosphere?

Back

21%

Card 3

Front

How long ago did Earth's atmosphere form?

Back

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Card 4

Front

How long ago did simple creatures form on Earth?

Back

Preview of the front of card 4

Card 5

Front

How is CO2 measured in the air?

Back

Preview of the front of card 5
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