Earth’s Layers Ms. Sikes

Earth’s Layers Earth has 3 layers: – 1. Crust – 2. Mantle – 3. Core

Crust Outermost layer 5-100km thick (thinnest layer of earth) 2 types of crust: – Continental – Oceanic

Mantle Located between the crust and the core Much thicker than the crust and contains most of earth’s mass No one has ever visited the mantle because the crust is too thick to drill through

Core Located in the “center” of the earth below the mantle Makes up 1/3 of the earth’s mass

Look at page 393 figure 3

Breaking the earth down even more… Even though the earth has 3 main layers, it has 5 physical layers Each layer has its own physical properties

5 Physical Layers Core has 2 parts: Inner Core: solid and in the center of the earth Outer Core: liquid, the outside part of the core

5 Physical Layers Mantle has 3 parts: 1.Mesosphere: lower part of the mantle, very strong layer 2.Asthenosphere: plastic layer on which pieces of the lithosphere move. Made of solid rock and flows very slowly 3.Lithosphere: outermost part of the mantle. Very rigid. Made of 2 parts: crust and upper part of mantle. (Is divided unto pieces called tectonic plates)

See page 394 One way to remember the order in which the layers go is: I O MAL (as owe Mal some money) Inner core, Outer core, Mesosphere, Asthenosphere, Lithosphere

Let’s Review Where is the core located? What are its 2 parts? What are those 2 parts made of?

Mantle Review Where is the mantle located? How many parts does it have? Name them on order from center of the earth to the outside

Crust Review Is the crust thick or thin? Which physical layer contains the crust?

Color and Label Earth Layers On your sheet, label the 3 layers of the earth Color the layers Make sure to add in the 2 interesting facts along with each label.