Download The Layer`s Of The Earth!

The Layers of the
Earth!
Earth Layers
• The Earth is divided into four main
layers.
Crust
Mantle
Outer Core
Inner Core
Temperature
increases as depth increases
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(30
km thick).
 Temperature- 0 to
over 100 Celsius
The Crust
 Made up of large amounts of silicon and
aluminum (Common rocks: Basalt and Granite)
 Two types of crust: oceanic crust and
continental crust
 Composed of plates on which the continents
and oceans rest
Continental Crust
Made of Granite
Thick (10-70km)
Buoyant (less
dense or lighter
than oceanic
crust)
Mostly old rock
Oceanic Crust
Made of Basalt
Thin (~7 km)
Dense or heavier
(sinks under
continental crust)
Young rock
The Mantle
 Gives earth a magnetic field
 The mantle is the largest
layer of the Earth (2,870 km
thick).
 Composition-silicon,magnesium,
iron, and aluminum
 Temperature- 500-4,000
Celsius
 The mantle is divided into two
regions: the upper
(lithosphere) and lower
(asthenosphere) sections.
Lithosphere
 Crust+upper mantle
 Lithospheric plates aka
plate tectonic found here
 Sits on top of the
asthenosphere
Asthenosphere
 Layer of hotter soft
rock similar to tar
 Convection Currents
which causes plates
to move occur here
 Convection currents
are caused by the
heating and cooling
of molten rock
Core
 Center of the earth
that is super dense or
heavy
 Composition- Iron and
Nickel
 3,450 km thick
 Temperature- 2,2005000 Celsius
 Composed of outer and
inner core
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 or
heavy.
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.
Review
1) What are the four layers of the Earth?
2) The Earth’s crust is very ______?
3) The mantle is the largest layer of the
Earth? True or False
4) Is the Outer Core a liquid or a solid?
Answers!
1) Crust, Mantle, Outer Core, Inner Core
2) Thin
3) True
4) Liquid