Atmosphere

?
recall the gases produced by volcanic activity?
Carbon Dioxide, small amounts ammonia, methane and hydrogen, water vapour.
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What did the early atmosphere contain?
1. little/ no oxygen 2. A large amount of CO2 3. water vapour and small amounts of other gasses.
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How did condensation of water vapour form oceans ?
Water vapor condensed in the earths as it cooled, this then fell as rain filing i the whole of the earths crust.
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one way carbon dioxide was reduced was by distillation of CO2 into the oceans, how does this happen?
the carbon reacted with other substance in the sea. it formed insoluble calcium carbonate and soulable calcium hydrogen-carbonate. the compound become concentrated in the shells of sea animals, when they died they formed carbonate rock.
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how did photosynthesis gradually increase the amount of oxygen?
green plants take in carbon dioxide and give out oxygen, this then gradually rises the amount of oxygen in the atmosphere because they are taking away the same amound of carbon dioxide as they are giving out oxygen replacing the carbon dioxide .
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current composition of the earths atmosphere
78% nitrogen 21% oxygen 1%argon and other gases
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what small changes can affect the atmosphere?
1. volcanic activity- as it release a number of gases 2. human activity- like burning fossil fuels, deforestation, transportation and farming
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Other cards in this set

Card 2

Front

What did the early atmosphere contain?

Back

1. little/ no oxygen 2. A large amount of CO2 3. water vapour and small amounts of other gasses.

Card 3

Front

How did condensation of water vapour form oceans ?

Back

Preview of the front of card 3

Card 4

Front

one way carbon dioxide was reduced was by distillation of CO2 into the oceans, how does this happen?

Back

Preview of the front of card 4

Card 5

Front

how did photosynthesis gradually increase the amount of oxygen?

Back

Preview of the front of card 5
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