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C1 Topic 1 edexcel

Princess Terin Core Science Higher Inglés 13 fichas

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1Where did the gases that formed the Earths early atmosphere come from?Volcanic activity
2How much oxygen was present in the Earths early atmosphere?Little/none
3How much Carbon Dioxide was present in the Earths early atmosphere?lots (18%)
4Name 4 other gases present in the Earth’s early atmosphere.Nitrogen, ammonia, methane, water vapour
5How do scientists use rocks to work out the composition of the Earth’s early atmosphere?Analyse the minerals in them and look for oxides.
6How do scientists believe the oceans were formed?Condensation of water vapour
7Describe two ways that the carbon dioxide levels in the early atmosphere were reduced.It dissolved in oceans and was locked up in sedimentary rocks
8What mineral is limestone made from?Calcium Carbonate
9How did photosynthesis affect the composition of the atmosphere?Removed Carbon Dioxide, added Oxygen
10What is the current composition of the Earths atmosphereNitrogen 78%
Oxygen 21%
Argon 0.9%
Carbon Dioxide 0.04%
other trace%
11State 3 ways humans changed the composition of the atmosphere.Burning fossil fuels, farming, deforestation
12What 2 main gases do volcanoes release in to the atmosphereNitrogen and Carbon dioxide
13What effect does deforestation have on the amount of carbon dioxide in the atmosphere, explainIncreases it as trees are no longer able to remove carbon dioxide through photosynthesis.