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CHANGES IN THE GEOSPHERE, ATMOSPHERE AND HYDROSPHERE:
How did the…
CHANGES IN THE GEOSPHERE, ATMOSPHERE AND HYDROSPHERE:
How did the changes to the biosphere affect the Earth's geosphere, atmosphere and hydrosphere?
GEOSPHERE
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zone of rigid rock that extends from the surface down to the mantle until the rocks become partly molten
oxygen reacts with sulfur and other chemicals in rock minerals, allowing them to be eroded more readily
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ATMOSPHERE
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Primitive earth's atmosphere (thin) mainly included: watervapour, hydrogen sulfide, helium, nitrogen methane,ammonia, carbon dioxide.
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the oxygen produced by cyanobacteria initially dissolved in the oceans where it reacted with dissolved iron
The rusting of earth
once the iron in the ocean had been removed, oxygen began to be released into the atmosphere (1.7bya)
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zone of gases which extend from the surface upwards until the gases are so thin that it is outerspace
during a thunderstorm, oxygen reacts with nitrogen in the atmosphere to produce nitrates
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present atmosphere (reached about 400mya): Nitrogen, oxygen, water vapour, carbon dioxide.
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HYDROSPHERE
zone of water that extends from within the lithosphere and possibly mantle to about 12km into the lower atmosphere. Form of: ice, vapour and liquid.
snowball earth
all or at least most of the oceans covered with ice. scientists believe there may have been a band of open water around the equator
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if global climates warm up, then water vapour levels increase and result in more warming as well as more rain, snow etc.
albedo effect.
major factor is the degree of cloud cover, highly reflective cryosphere.
if a cooler earth, less greenhouse effect of water vapour. it becomes drier due to less rain and snow.
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