Transcript The Layers of Earth

http://www.uni-mainz.de/FB/Geo/mineralogie/Earth_System_Cycles/whole%20earth.jpg
How did it get here?????
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Well, you
remember how
the Sun formed …
The planets came
about in the
protostar stage.
This is a protostar
Protostar
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The area
surrounding the
soon to be Sun was
filled with planet
forming material
that revolved around
This is known as the
Accretion Disk
Cosmic Collisions
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Over time, the
material slams
together forming the
planets.
The Planets
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What's the
difference among
the inner planets
and the outer
planets?
Why do you think
that is so?
The Layers of Earth
The Core
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1/3 the mass of
Earth
Heat maintained by
insulation of outer
layers
Powers all geologic
activity
Inner Core
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Solid iron/nickel
Pressure from above
causes inner core to
be solid
Outer Core
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“Liquid hot molten
metal”
Just outside of the
inner core
Mantle
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2/3 the mass of
Earth
Hot layer of rock
under extreme
pressure
Insulates the core
Transfers heat to
crust for geologic
activity
Upper Mantle
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Asthenosphere
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“weak layer” that
can flow
Rock and magma
mix
Behaves like putty
Heat travels in
convection cells
Little Jack – Meet the Fockers
GET IT
Convection
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As the hot mantle
material rises, it
cools and sinks back
down.
This rotation pulls
the crust and causes
it to move
This image displays
the movement
Upper Mantle Continued
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Lithosphere
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“Rock layer” floating
on top
Crust rides on top of
this layer
Brittle, cracks under
stress
Experiences
earthquakes
http://www.xenophilia.com/zb/zb0008/lithosphere.jpg
The Crust
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We live on it
Mostly light elements
Most abundant:
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Oxygen 62%, Silicon 21%, make up sand
17% Al, Fe, Ni, Mg, Na, Ca
Rides on lithosphere
3 types of crust
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Oceanic
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Thin young crust
Ocean floor material
Dense volcanic rocks
Continental
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Thick, old crust
Land mass
Erosion made rocks