Transcript Layers of Earth - Skyline School

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1. The Structure of Earth
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Earth is shaped like a ball and is made
up of four layers.
It is about 8,000 miles in diameter
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Layers of Earth
At the very center of Earth is the inner
core
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Vocabulary
Inner core
The center of Earth that is about 800
miles thick and made of solid iron and
nickel
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The inner core is very hot,
about 9,0000 F
Although it is hot enough to melt, the
inner core is solid because it is under
so much pressure from the layers
above
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The molecules of iron and nickel
cannot spread out enough to become
liquid
Iron
Nickel
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Iron and nickel causing magnetic
fields (blue are movements inward
and yellow are movements
outward)
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The outer core is about 1,400 miles
thick
Vocabulary:
Outer core
The layer of Earth is outside the inner
core and made of hot liquid metal
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The temperature of the outer core
ranges from 4,0000 F to 9,0000 F
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Because the outer core is not under as
much pressure as the inner core,
the iron and nickel have melted
(molten)
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The outer core is made of hot liquid
metal
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The mantle is
rd
the 3
layer of the Earth
Vocabulary:
mantle
The thickest layer of Earth that lies
just below the crust
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The mantle seems to be made up of
several layers
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The top layer of the mantle is hot solid
rock
The bottom layer is liquid rock
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The rocks in the mantle are made
mostly of silicon, aluminum, iron, and
magnesium
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The crust is the 4th layer of Earth
Vocabulary:
crust
The outer layer of Earth that makes
up the continents and ocean floors
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The crust is about 20 miles thick in
most places
But can be as little as 5 miles thick
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The crust makes up the continents and
ocean floors
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The crust is made up of many kinds of
rock, such as granite, sandstone, and
marble
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