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The Three Layers of Earth SC Standard 8-3.1


Betty Smith

on 22 November 2013

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Transcript of The Three Layers of Earth SC Standard 8-3.1

Earth has layers that have
specific conditions and composition.

The Three Layers of Earth
Summarize the layers--crust, mantle,
and core--on the basis of relative
position, density, and composition.

Relative Position
outermost layer
thinnest under the ocean
thickest under continents
crust & top of mantle called the lithosphere
Relative Density
least dense layer overall
oceanic crust (basalt) is more dense than continental crust (granite)
solid rock--mostly silicon and oxygen
oceanic crust--basalt
continental crust--granite
Relative Position
middle layer
thickest layer
top solid portion called the lithosphere
molten (melted) portion just below the lithosphere is the asthenosphere
Relative Density
density increases with depth because of increasing pressure
hot softened rock
contains iron and magnesium
Relative Position
inner layer
consists of two parts--outer core and inner core
Relative Density
heaviest material
most dense layer
mostly iron and nickel
outer core--slow flowing liquid
inner core--solid
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