c2 the structure of the earth

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what does the lithosphere comprise of?
crust and top part of the mantle
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what is the properties of the lithosphere?
relatively cold and rigid
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what is the lithosphere made of?
techtonic plates which are less dense than the mantle below
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how is the information about the earth collected?
the crust is too thick to drill through so most of our information about the earth is collected from seismic waves produced by earth quakes or man made explosions
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what is the mantle?
a zone between the core and the crust.
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properties of the mantle?
cold rigid but just below the crust but at great depths it is hot non-digid and able to move.
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why does the mantle temperature increase with depth?
the earths core transfers energy so the temperature increases with depth
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how to the tectonic plates move?
convection currents slowly move plates
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what happens in the movement of oceanic plates?
oceanic crust is denser than the continental crust when these plates collide the oceanic plate which is cooler at the margins sinks pulling more of the plate down and partially melting it as it reaches the hotter part of the mantle this subconduction
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why do most people now accept the theory of tectonic plates?
it explains a wide range of evidence, it has been discussed and tested by many scientists
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why was wageners continental drift theory accepted?
in the 1960s new sea floor spreading evidence was found subsequent research led to it slowly becoming accepted
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what causes volcanoes?
magma rises through the earths crust because it is less dense than the crust this causes volcanos
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why to geologists study volcanos?
to try and forecast future eruptions and reveal more about the structure of the earth
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what are the types of igneous rock formed from lava?
iron rich basalt rock comes from runny lava in slower eruptions. Silica rich rhyolite rock comes from thick lava in explosive eruptions
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Card 2

Front

what is the properties of the lithosphere?

Back

relatively cold and rigid

Card 3

Front

what is the lithosphere made of?

Back

Preview of the front of card 3

Card 4

Front

how is the information about the earth collected?

Back

Preview of the front of card 4

Card 5

Front

what is the mantle?

Back

Preview of the front of card 5
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