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14 Cards in this Set
- Front
- Back
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The evaluation of earths atmosphere |
Phase 1 - volcanoes - gave out gasses
Phase 2 - green plants - evolved & produced oxygen
Phase 3 - complex organisms evolved |
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Phase 1 |
Volcanoes - earths atmosphere was originally molten for many millions oh years. So hot atmosphere Boiled away
Cooled down & thin crust formed |
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Phase 2 |
Green plants evolved over most of the earth.
A lot of early CO2 dissolved into the oceans, green plants also removed CO2 & produced O2 by photosynthesis
When plants died & were buried under layers of sediment, the carbon removed became locked up in sedimentary rocks as insoluble (doesn't dissolve in water) carbonates and fossil fuels |
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What effects accuracy |
Faulty equipment Scientists making mistakes |
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A combustion reactiob |
When a chemical reacts with oxygen and releases energy |
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A combustion reactiob |
When a chemical reacts with oxygen and releases energy |
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How is sulfur dioxide formed |
When fuels with with sulfur burn they release sulfur dioxide - causes acid rain |
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What causes carbon monoxide |
When there is not enough oxygen to burn fuels completely , incomplete combustion takes place - which formed carbon monoxide - poisonous gas which can kill you when breathed in |
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How is nitrogen oxide formed |
In the high temperature of vehicle engines, nitrogen and oxygen react to form nitrogen oxide - irritates lungs and causes acid rain |
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How to reduce pollution |
Use less electricity - less fossil fuel burnt in power stations
Use public transport or cars with efficient engines
Use electric batteries or biofuels - renewable |
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How is nitrogen monoxide formed |
When nitrogen & oxygen are exposed at high temperature - car engines |
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Nitrogen dioxide |
When Nitrogen monoxide reacts with more oxygen |
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Dangers of nitrogen oxides |
Similar to sulphur dioxide They produce a dilute nitric acid which eventually falls to earth as acid rain |
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How can rocks show movement of the warth |
The pattern of normal and reversed polarised rocks can be used to east image age of parts of earths crust & track movement of tectonic plates |
