3. The
Earth’s
Crust
The crust of
the Earth is
composed of a
great variety
of igneous, meta
morphic, and sedi
mentary
rocks. The crust is
underlain by the
mantle.

4. The
Earth’s
Mantle
is a part of
a terrestrial planet or
other rocky body large
enough to
have differentiation by
density. The interior
of the Earth, similar to
the other terrestrial
planets, is chemically
divided into layers.
The mantle is a highly
viscous layer between
the crust and the
outer core.

5. The
Earth’s
outer
core
we next would
encounter the Earth’s
outer core, which
extends to a depth of
around 3000 miles
beneath the surface.
It is believed that this
outer core is made up
of super-heated
liquid molten lava.
This lava is believed
to be mostly
iron, and nickel.

6. The
Earth’s
inner
core
we would reach
the Earth’s inner
core. The inner
core extends
another 900 miles
inward towards
the center of the
Earth. It is
believed that this
inner core is a
solid ball of mostly
iron, and nickel.