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Card 6
Front
What is the approximate percentage of oxygen in the atmosphere today?
Back
Card 7
Front
What is the approximate percentage of argon in the atmosphere today?
Back
Card 8
Front
What is the approximate percentage of carbon dioxide in the atmosphere today?
Back
Card 9
Front
What were the first two gases in the early atmosphere?
Back
Card 10
Front
What is the reason for the decrease in carbon dioxide in the Earth's atmosphere?
Back
Card 11
Front
The oceans were formed when _______ condensed?
Back
Card 12
Front
In Earth's early atmosphere what was the surface made of?
Back
Card 13
Front
What gases did volcanoes give out in Earth's early atmosphere?
Back
Card 14
Front
When was the Earth formed; according to scientists?
Back
Card 15
Front
What is condensation?
Back
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