How is carbon dioxide added to and removed from the atmosphere?
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Card 7
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What are the percentage compositions of gases in the atmosphere today?
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Card 8
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What is the process that started billions of years ago and helped to change the carbon dioxide in the atmosphere into oxygen gas?
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Card 9
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The early atmosphere around the Earth contained ammonia gas. As plants evolved, the oxygen they produced helped to change the ammonia gas into another gas found in the atmosphere today. Which gas is this?
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Card 10
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The early atmosphere around the Earth contained methane gas. As plants evolved, the oxygen they produced helped to change this methane gas into two other gases found in the atmosphere today. Which two gases are they?
