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Atmosphere
Early Atmosphere:

Gases present:
methane [CH4]
ammonia [NH3]
water vapour or steam [H2O]
carbon dioxide [CO2]

Why?

Earth was very hot
Lots of volcanoes

What happened next?

Earth cooled
Fewer volcanoes

Gases:
No more:

methane [CH4]
ammonia [NH3]
water vapour or steam [H2O]
carbon dioxide [CO2]…

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What happened to the CO2?

Most dissolved in oceans- used by sea creatures to make calcium carbonate for their shells
The rest used by plants in photosynthesis




C1 Revision-Atmosphere2012

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Exam practice

Foundation-




C1 Revision-Atmosphere2012

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C1 Revision-Atmosphere2012

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Higher




C1 Revision-Atmosphere2012

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C1 Revision-Atmosphere2012

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C1 Revision-Atmosphere2012

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Examples of 6 mark questions:

Our atmosphere is very different from how it was 6 billion years ago. Explain why this is so.

1. Early Earth very hot with volcanic eruptions
2. Main gases:methane, ammonia, carbon dioxide, water vapour
3. Earth cooled and there were fewer volcanoes…

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