Structure Of The Earth

Structure Of The Earth

Inside the Earth Chapter 16 What are we walking on? The Center Of The Earth Earth Layers The Earth is divided into

four main layers. *Inner Core *Outer Core *Mantle *Crust The Crust * The Earths 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. The Crust

The crust is only about 35 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents The Crust

Outer layer 5-100 km thick 2 types of crust Oceanic (very dense, made of basalt) Continental (less dense, made of granite)

Oceanic and Continental Crust Granite/older Basalt/Younger

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. 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. Earths Layers How are the earths layers similar to an egg?

Shell=crust Egg white=mantle Yolk=core Physical Structure of the Earth Lithosphere- rigid outer layer (crust) Asthenosphere- solid rock that

flows slowly (like hot asphalt) Lithosphere The lithosphere (geosphere) is the "solid" part of Earth. It has two parts, the crust and the upper mantle The lithosphere sits on the asthenosphere.

The Earths Plates are the lithosphere. It is the rocky, solid portion of the crust. Remember that it is made up of mostly Silicon( Si) and Oxygen (O). Asthenosphere This is the layer below the lithosphere. This layer is plastic like.

It is somewhat solid/liquid. You can say that it is malleable. Very important in terms of plate tectonics. Tectonic Plates Earths crust is broken into about 19 pieces

These plates move on top of the asthenosphere

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