The Early Atmosphere
A Changing Atmosphere
Oxygen in the Atmosphere: PCA
The Atmosphere Today
What you should know:
- 1.1 Know that the gases produced by volcanic activity formed the Earth’s early atmosphere.
- 1.2 Know that the early atmosphere contained:
- a) little or no oxygen
- b) a large amount of carbon dioxide
- c) water vapour and small amounts of other gases.
- 1.3 Know why there are different sources of information about the development of the atmosphere which makes it difficult to be precise about the evolution of the atmosphere.
- 1.4 Be able to describe how condensation of water vapour formed oceans.
- 1.5 Be able to describe how the amount of carbon dioxide in the atmosphere was reduced by:
- a) the dissolution (dissolving) of carbon dioxide into the oceans
- b) the later incorporation of this dissolved carbon dioxide into marine organisms which eventually formed carbonate rocks
- 1.6 Be able to explain how the growth of primitive plants used carbon dioxide and released oxygen by photosynthesis and consequently the amount of oxygen in the atmosphere gradually increased.
- 1.7 Revise the investigation on the proportion of oxygen in the atmosphere - e.g. an experiment to determine the % of oxygen in the atmosphere.
- 1.8 Be able to describe the current composition of the atmosphere and interpret data sources showing this information.
- 1.9 Be able to demonstrate an understanding of how small changes in the atmosphere occur through:
- a) volcanic activity
- b) human activity, including the burning of fossil fuels, farming and deforestation
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