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11 Cards in this Set
- Front
- Back
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Describe the Earth's surface in the first stage of the evoulution of the atmosphere |
The Earth's surface was molten but eventually it cooled slightly and a thin crust formed |
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which gases did it volcanoes give out in the early atmosphere? |
Carbon dioxide water vapor and small amounts of other gases |
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What did the early atmosphere mostly consist of? |
Co2 |
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How did carbon dioxide in the second phase of the evolution of the atmosphere |
Carbon dioxide dissolved in the oceans and marine organisms took it in and it became locked in carbonate rocks when they died, green plants also evolved which remove co2 and produced o2 |
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How did more complex organisms manage to evolve |
Oxygen a lot more complex organisms to evolve and created the ozone layer which blocked harmful rays from the Sun |
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What is the ozone layer made of? |
O3 |
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What is the atmosphere made up of now? |
78% nitrogen 21% oxygen Small amounts of other gases including 0.04% carbon dioxide |
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Where is evidence on the evoulution of the atmosphere found? |
In Antarctic ice cores what struck bubbles of air each year and by digging down through the layers you can see how the air has changed |
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Which three human activities are changing today's atmosphere? |
Burning fossil fuels which releases co2 deforestation increases co2 livestock farming releases methane (ch4) |
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What gases can volcanic activity add to today's atmosphere? |
Sulfur dioxide and carbon dioxide |
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What is the chemical equation for the reaction which measures the proportion of oxygen in the atmosphere? |
2cu+o2>2cuo |
