Transcript Earth`s Layers

Earth’s Layers
Chapter 2,
section1
Earth Layers
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The Earth is divided into four main
layers.
*Inner Core
*Outer Core
*Mantle
*Crust
The Crust
* The Earth’s crust is like
the skin of an apple. It
is very thin compared to
the other three layers.
*The crust makes up 1% of
the Earth.
* The crust of the Earth is
broken into many pieces
called plates.
The Mantle
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The mantle is the
layer below the
crust.
The mantle is the
largest layer of the
Earth.
The mantle is
divided into two
regions: the upper
and lower sections.
Outer Core
* The core of the
Earth is like a ball
of very hot metals.
* The outer core is
liquid.
* The outer core is
made up of iron and
is very dense.
Inner Core
* The inner core of
the Earth has
temperatures and
pressures so great
that the metals are
squeezed together
and are not able to
move.
* The inner core is a
solid.
How deep are the layers?
Crust: 3-43 miles deep
 Mantle: about 1,790 miles
deep
 Outer Core: about 1,410
miles deep
 Inner Core: about 750 miles
deep
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Which layer is the hottest?
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Inner Core-may be as hot as the sun
What are Plates?
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Continent-sized slabs that make up
the crust and the mantle
Plates are constantly moving, very
slowly
Plates Move:
Away from each other
 Toward each other
 Past each other
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When Plates Move Together

Mountains or Volcanoes
are formed
Volcano Eruption
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Video
When Plates Move Past
Each Other
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Earthquakes occur
Railroad tracks after an
earthquake.
For Discussion
What are the four layers
of the earth?
 Crust, Mantle, Inner and
outer Core
 On which layer do we
live?
 Crust

Which is the thickest
layer?
 Mantle
 Which layer is the
hottest?
 Inner Core

How often do earth’s
plates move?
 They are in constant
motion.
 At what speed do they
move?
 Slowly (only a few
centimeters per year)

What is formed when
plates move together?
 Mountains and
Volcanoes
 What happens when
plates slide past each
other?
 Earthquakes occur.
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