Layers Of The Earth

Layers of the Earth

It’s not just a big hallow ball!

Layers of the Earth

If we cut it in half, it would have four different layers.

Layers of the EarthWhat is a good model of the earth?

Layers of the Earth

But first, the layers of an egg!

Shell

Albumen Layer“The White Part”

Yolk

Layers of the Earth

The Incredible (But Not Quite) Edible Egg!

Crust

Mantle

Outer CoreInner Core

Layers of the Earth

The Incredible (and absolutely inedible) Earth

Crust

Mantle

Outer CoreInner Core

Show your stuff!

What layer is

this?

What layer is this?

What layer is

this?

What layer is this?

CRUST

MANTLE

OUTER CORE

INNER CORE

CRUST

Made of SOLID ROCK

MANTLEMade of MELTED ROCK

OUTER CORE

Made of MELTED METAL

INNER COREMade of SOLID METAL

Why is it

SOLID?

TheSnowball

Effect!

The Crust• This is where we live!

• The Earth’s crust is made of:

Continental Crust- thick (10-70km)

- buoyant (less dense than oceanic crust)

- mostly oldOceanic Crust

- thin (~7 km)- dense (sinks under continental

crust)- young

How do we know what the Earth is made of?

• Geophysical surveys: seismic, gravity, magnetics, electrical, geodesy

• Acquisition: land, air, sea and satellite

• Geological surveys: fieldwork, boreholes, mines

Using Seismic waves