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The Earth's sea and atmosphere

Mr Anderson

Edexcel GCSE Chemistry 1 Topic 1

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3.Type of rock formed by compression of layers of small particles of solid matter.
6.Gas making up around 1% of today's atmosphere.
8.Chemical contained in the shells of marine organisms. (2 Words)
9.Approximate percentage of today's atmosphere that is oxygen. (2 Words)
11.Gas forming a big part of Earth's early atmosphere, particularly whilst Earth was still very hot. (2 Words)
12.Process by which carbon dioxide is removed from the atmosphere and into the oceans.
13.Gas making up just 0.04% of today's atmosphere. (2 Words)
14.Thought to be the source of Earth's earliest atmosphere.
15.Gas produced by early forms of life.
1.Process performed by living organisms that uses oxygen and releases carbon dioxide.
2.An important rock in which shells of marine organisms can often be found.
4.A human activity that has a significant impact on our atmosphere by removing trees from our wilderness.
5.Process performed by living organisms that uses carbon dioxide and releases oxygen.
7.Main gas in Earth's early atmosphere. (2 Words)
8.Process which formed the Earth's oceans.
10.Gas making up around 78% of the Earth's atmosphere today.

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