Transcript Earth Lesson 9

THE LAYERS OF THE EARTH!
EARTH UNIT- LESSON 9
OBJECTIVES
• Students will have an
understanding of the layers of the
earth.
VOCABULARY
• crust:
• mantle:
• inner core:
• outer core:
EARTH LAYERS
• The Earth is divided into four
main layers.
1.
2.
3.
4.
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 inside of
the Earth contains a lot of pressure.
After the Earth was made, it began
to cool. The outer shell became a
hard crust of rock.
• This crust is light in color and is
made mostly of granite. Above the
granite is sedimentary rock.
The crust
makes up 1%
of the Earth.
THE MANTLE
• The Mantle is the second
layer of the Earth. The
mantle of the Earth is solid
rock, but it’s not
completely hard. Because
of the intense heat, the
mantle is moldable, like
play dough. The mantle
slowly moves. This
movement causes
earthquakes and volcanic
eruptions.
The mantle is largest
layer of the Earth.
The mantle is 1,800
miles deep.
OUTER CORE
• The outer core is
liquid. The liquid
is made of iron
and nickel.
• The core of the
Earth is like a
ball of very hot
metals.
1,400 miles of
thick liquid iron
and nickel.
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.
• Although the inner core is
very hot, pressure from the
weight of the rest of the Earth
doesn't’t allow the material
to melt.
• The inner core is made of
solid iron that is as hot as the
sun’s temperature.
1,400 miles of
thick liquid iron
and nickel.
LAYERS OF THE EARTH
• Click here to learn more about each layer
• http://www.learner.org/interactives/dynamicearth/
structure.html
• Bill Nye Earth’s Crust episode
• https://www.youtube.com/watch?v=Q6fT1vGYPzA
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