I’M THE MAP… I’M THE MAP!
ITINERARY: THE EARTH’S LAYERS
• Crust - The Earth's outermost surface is
called the crust. The crust is relatively
light and brittle. Most earthquakes occur
within the crust.
• Mantle - The mantle is relatively flexible
so it flows instead of fracturing.
• Outer core – Fluid layer that contains
iron. When it flows it generates the
Earth’s magnetic field.
• Inner core – Solid innermost layer of the
Earth.
CRUST
is made up of the
crust and the
Moho.
The crust is typically about
25 miles thick beneath
continents, and about 6.5
miles thick beneath oceans..
Most earthquakes occur
within the crust. The crust in
this image is much smaller in
the real earth!
Mohorovicic discontinuity is the dividing
line between the Crust and the mantle.
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.
TWO TYPES OF CRUST
• Oceanic (very
dense, made of
basalt)
• Continental (less
dense, made of
granite)
OCEANIC AND CONTINENTAL CRUST
THE MANTLE
• 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.
UPPER MANTLE
is the outer layer
of the mantle.
• The region just below the
crust and extending all the
way down to the Earth's
core is called the mantle.
• This is where magma is
stored.
• Molten rocks in the
asthenosphere is rigid.
LOWER MANTLE
• Middle layer
• Very thick layer
• Molten rocks are
fluid and moving
tin a circular
motion called the
convection current
THE CORE
• Made mostly of
iron
• 1/3 of the
earth’s mass
• Very hot
CORE
• Beneath the mantle is the
Earth's core. The Earth's
core consists of a fluid
outer core and a solid
inner core. Because the
outer core contains iron,
when it flows it generates
a magneAtic field. This is
the source of the Earth's
magnetic field.
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.