Download Earth`s Interior

Earth’s Interior
Earth Science
PowerPoint
By Mr. Whitmyer
Exploring Inside Earth
Scientists can not
get a clear picture of
the center of the
earth due to the
extreme conditions,
both heat and
pressure, below the
crust of the earth.
Exploring Inside Earth
Geologists have
used two main types
of evidence to learn
about the earth’s
interior: Direct
evidence from rock
samples and indirect
evidence from
seismic waves
Exploring Inside Earth
Scientists have
drilled as much as
12km into the earths
crust. This is about
5 miles. This allows
samples of rocks
from deep in the
earth to be studied
Exploring Inside Earth
Seismic waves
Vibrations that travel
through the earth
released during
earthquakes
We use the speed and
the path of the
seismic waves
A Journey to the Center
of the Earth
The three main layers
of the earth are the
crust, the mantle and
the core These areas
are different in the
areas of:
Size
Composition
Pressure
A Journey to the Center
of the Earth
Temperature
Change
The temperature gets
warmer the further
you go into the
earth
This is a result of the
formation of earth
and radioactivity
A Journey to the Center
of the Earth
Pressure
Results form a force
pressing on an area
The deeper you go the
higher the pressure
gets much like a
swimming pool
The Crust
Crust
The layer of rock that forms earths outer skin
Includes:
Rocks
·Soil
Mountains
·Water
The Crust
The crust is thickest
under high
mountains and
thinnest under the
oceans
The crust is typically 5
to 40 km thick but
can be up to 70 km
thick under
mountains
The Crust
The oceanic crust is
mostly Basalt which
is a dark igneous
rock with a fine
texture
The Crust
Continental crust is
mostly granite which
is light colored and
has a coarse texture
The Mantle
Mantle
A layer of solid
material made of
very hot rock
The Mantle
Earths mantle is
made up of rock
that is very hot but
solid. Scientists
divide the mantle
into layers based on
characteristics of
those layers. The
mantle is about
3000 km thick.
The mantle
Lithosphere
The upper most part
of the mantle and
the crust together
The Mantle
Asthenosphere
This layer is soft like
road tar and can
bend like plastic but
is still a solid.
Asthenes Means
Weak
The Mantle
The lower Mantle
A solid layer that
extends to the
earths core
The Core
The core is made
mostly of the metals
Iron and nickel. It
consists of two parts
a liquid outer core
and a solid inner
core
The Core
Outer Core
A layer of molten
metal that surrounds
the inner core. It is
liquid even though it
is under great
pressure. It is
mostly made of
Iron and Nickel.
The Core
Inner Core
A dense ball of solid
metal, mostly Iron
and nickel. It is
solid due to extreme
pressure pushing
the metal atoms
together. Extremely
dense