Edexcel C1 Topic 1 Earth Atmosphere

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Topic 1 The Earth's sea and atmosphere
1.1 Recall that the gases produced by volcanic activity formed the Earth's early
atmosphere
1.2 Recall 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 Explain 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 Describe how condensation of water vapour formed oceans
1.5 Describe how the amount of carbon dioxide in the atmosphere was reduced by:
a the dissolution 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 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 Investigate the proportion of oxygen in the atmosphere
1.8 Describe the current composition of the atmosphere and interpret data sources
showing this information
Unit C1: Chemistry in our world
1.9 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
Draft Version of Collins Education TextBook on Earths Atmosphere
http://www.collinseducation.com/Style%20Library/GCSE%20Science%20files/Collins%
20New%20GCSE%20Science%20Edexcel%20Sample%20Material%20for%20C1.pdf

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