The earth and its atmosphere

What are the layers of the earth?
crust, mantle, outer core, inner core
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what are the 3 main gases in our atmosphere today?
oxygen, nitrogen and carbon dioxide
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what was earth's atmosphere like in the past?
the early atmosphere contained high levels of CO2
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explain how the atmosphere has changed to contain oxygen
life evolved to form single-celled organisms which started to photosynthesise
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what is continental drift?
continental drift is when heat release from radio active processes cause convection currents
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what causes the motion of the plates?
the plates move because of huge forces caused by convection currents
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what happens at plate boundaries?
at the plate boundaries there tends to be volcanoes and earthquakes occurring due to the movement of the plates
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what is the carbon cycle?
the carbon cycle shows how carbon is moved from place to place around the earth
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why have carbon levels been increasing?
the burning of fossil fuels is adding carbon dioxide to the atmosphere faster than it can be removed. This means that the level of carbon dioxide in the atmosphere is increasing, contributing to global warming.
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what is the Miller-Urey Experiment?
the aim was to see if substances now made by living things could be formed in the conditions thought to have existed on the early earth.
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what are meteorites?
a meteorite is a solid piece of debris from a source such as an asteroid or a comet, which originates in outer space and survives its impact with the earth's surface. it is called a meteoroid before its impact, a meteorite's size can range from S-XL
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what are deep sea vents? (hydrothermal vents)
a hydrothermal vent is a fissure in planet's surface from which geothermally heated water issues. hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins and hotspots.
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Other cards in this set

Card 2

Front

what are the 3 main gases in our atmosphere today?

Back

oxygen, nitrogen and carbon dioxide

Card 3

Front

what was earth's atmosphere like in the past?

Back

Preview of the front of card 3

Card 4

Front

explain how the atmosphere has changed to contain oxygen

Back

Preview of the front of card 4

Card 5

Front

what is continental drift?

Back

Preview of the front of card 5
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