Earth’s Layers Summarize the 3 layers of Earth on the basis of relative position , density and composition.

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Presentation transcript:

Earth’s Layers Summarize the 3 layers of Earth on the basis of relative position , density and composition.

Earth is divided into 3 basic layers: 1. Crust 2. Mantle 3. Core These layers are then subdivided into smaller layers.

The Earth is like a boiled Egg How are the earth’s layers similar to an egg? Shell=crust Egg white=mantle Yolk=core

Crust Is the outermost layer on the earth. (EGG SHELL) Thickness varies. Under mountains it can be as thick as 60 km and less than 5 km under the ocean. It is the least dense of all the layers. (lightest layer) It is made up of silicon and oxygen.

2 TYPES OF CRUST: Oceanic crust is very dense, made of Basalt. Continental crust is less dense, made of Granite.

GRANITE BASALT

MANTLE: Located below the crust. (Egg White) It is the largest layer (about 2900 km thick). Rock layers are movable. (plastic) Hot soften rocks made up of more magnesium and iron. Density increases with depth due to increase in pressure.

MANTLE: Divided into 2 parts Upper mantle Lower mantle. Contains the “Moho” (Mohorovicic discontinunity)

CORE: (Egg Yolk) Located below the Mantle. It is divided into 2 layers Outer Core Inner Core

Outer Core: The O.C. is about 2250 km thick. is liquid and is made up of mostly iron (easily magnetized) The movement of materials in the liquid O.C. is inferred to be the cause of Earth’s magnetic field! (highlight in your notes) The O.C. is about 2250 km thick.

Inner Core: Is the center of the Earth – 1200 km thick. It’s solid iron and nickel. Most dense layer (heaviest) (highlight in notes) The increased pressure causes the I.C. to be solid

In your notes lets draw together a diagram of the Earth. CRUST MANTLE OUTER CORE INNER CORE

This is the “crunchy” layer of the Earth. Look at the sub-layers of the mantle LITHOSPHERE: This is the “crunchy” layer of the Earth. It includes the crust and the very uppermost part of the upper Mantle ASTHENOSPHERE: Soft – can bend like plastic, layer in the upper portion of the mantle It is located right below the Lithosphere. Lithosphere floats on this layer (like jello)

Lithosphere Asthenosphere CRUST MANTLE OUTER CORE INNER CORE

In Review: What are the 3 main layers of the Earth? Crust, Mantle, Core Which layer is the least dense? Crust Which core layer is solid iron and nickel? Inner core What is the name given to the “crunchy” layer of the crust and uppermost part of the mantle? Lithosphere 5. The motion in this layer is the reason Earth has a magnetic field. Outer core