Structure of the Earth

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What is the earth's crust?
The earth's hard outer layer.
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What is the earth's crust made of?
Igneous, metamorphic and sedimentary rocks.
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How thick is the earth's crust?
It ranges from 5km to 70km thick.
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What are the two types of crust?
Continental and oceanic.
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What does the lithosphere consist of?
The crust and upper mantle.
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How deep is the lithosphere?
It extends to a depth of 100km.
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What is the asthenosphere?
The upper layer of the mantle, below the lithosphere.
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What occurs in the asthenosphere?
Convection.
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How deep is the asthenosphere?
Up to 60km deep in some places.
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Where does the mesosphere lie?
Below the lithosphere and asthenosphere, but above the outer core.
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What is the mesosphere?
A hot, semi-solid rock.
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How thick is the mesosphere?
Up to 2100km thick.
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How much of the earth's volume does the mantle take up?
84%.
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How thick is the mantle?
2900km.
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What is the mantle made of?
Magma, a semi-molten rock.
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What does the outer core do?
Surrounds the inner core.
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What is the outer core?
A liquid layer made of iron and nickel.
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How hot is the outer core?
4000 degrees celcius.
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What is the inner core?
A solid made from iron and nickel.
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How hot is the inner core?
5500 degrees celcius.
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By how much does the inner core grow every year?
0.5mm.
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Other cards in this set

Card 2

Front

What is the earth's crust made of?

Back

Igneous, metamorphic and sedimentary rocks.

Card 3

Front

How thick is the earth's crust?

Back

Preview of the front of card 3

Card 4

Front

What are the two types of crust?

Back

Preview of the front of card 4

Card 5

Front

What does the lithosphere consist of?

Back

Preview of the front of card 5
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