Topic 8

  • Created by: Laurenkj
  • Created on: 12-11-18 17:34
What did volcanic activity on the early earth throw into the the atmosphere
Carbon dioxide, water vapour and small amounts of sulphuric acids
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What did the early atmosphere not have
Early atmosphere Had little to no oxygen
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What happened to the earth next
It started to cool
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What was the result in the earth cooling
Less volcanic activity - less gas in atmosphere. Water vapour the leaves the atmosphere
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Where did the seas and oceans come from
When the water vapour condenses it rains alot
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What reduced the amount of CO2 in the atmosphere
CO2 dissolved in seas and oceans and became trapped, forming carbonates
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What was the first evidence of oxygen
In 2.5 billion year old rocks
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Where did oxygen come from after
Once oceans were cool enough microscopic organisms could survive and photosynthesised. Then land plants developed and photosynthesised
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How much nitrogen is there in today’s atmosphere
78%
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How much oxygen is there in today’s atmosphere
21%
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How much of other gases are there in today’s atmosphere
1% - noble gases, carbon dioxide and water vapour
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What is one practical that can show how much oxygen there is in the atmosphere
Floating candle (image in book). Candle uses O2 to burn, water fills gap left by O2 and will rise 20%
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Other cards in this set

Card 2

Front

What did the early atmosphere not have

Back

Early atmosphere Had little to no oxygen

Card 3

Front

What happened to the earth next

Back

Preview of the front of card 3

Card 4

Front

What was the result in the earth cooling

Back

Preview of the front of card 4

Card 5

Front

Where did the seas and oceans come from

Back

Preview of the front of card 5
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