Layers of the Earth

Discussing the Layers of the

Earth

Journeyto the

Centerof the

Earth

Things to bring:

• Map

• Flashlight

• Notebook (for note keeping, of course)

• Heat resistant camera (If you want to take your SELFIE down there)

• Food, a lot. And water.

• Extra clothes, those that do not burn easily.

• Extra courage

I’M THE MAP… I’M THE MAP!

Crust

OuterCore

Mantle

InnerCore

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.

Are you ready?

First stop:

The Crust

CRUST 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!

is made up of the crust and the Moho.

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

Next Destination:

The Mantle

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• 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.

is the outer layer of the mantle.

LOWER MANTLE• Middle layer

• Very thick layer

• Molten rocks are fluid and moving tin a circular motion called the convection current

Moving Deeper:

The Core

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.

The Outer 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.

The Inner Core

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.