C1 Topic 1- The sea and atmosphere Flashcards

1
Q

What is the atmosphere made up of?

A

78% nitrogen
21% oxygen
1% argon
0.04% carbon dioxide

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2
Q

What made up the early atmosphere?

A

Mostly carbon dioxide with virtually no oxygen.

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3
Q

How were the oceans formed?

A

The volcanos gave out lots of gases such as carbon dioxide and water vapour. When the water vapour condensed it formed the oceans.

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4
Q

How did oxygen levels increase and carbon dioxide levels decrease?

A

A lot of carbon dioxide dissolved in the oceans when they were formed. An increase in green plants decreased carbon dioxide levels and increased oxygen levels due to photosynthesis.

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5
Q

How was the ozone layer formed what did it do?

A

The ozone layer formed from the oxygen increase. This blocked harmful rays from the sun and enabled more complex organisms to evolve.

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