Earth Structure Notes.

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Presentation transcript:

Earth Structure Notes

Composition (What it is made of) Crust Mantle Core

The Crust Outer layer 5 - 100 km thick (3 – 60 miles thick) Made of oxygen & silicon 2 types of crust Oceanic (very dense, made of basalt) Continental (less dense, made of granite)

Oceanic and Continental Crust Oceanic crust 3 – 5 miles thick Continental crust on average 18 miles thick

The Mantle Middle layer Very thick layer Made of iron & magnesium 2,900 km thick Solid near core Upper part is semi-solid

The Core Made mostly of iron & some nickel 1/3 of the earth’s mass Very hot 3,428 km thick

Earth’s Layers How are the earth’s layers similar to an egg? Shell=crust Egg white=mantle Yolk=core

Physical Structure of the Earth (5 Layers) Lithosphere Asthenosphere Mesosphere Outer Core Inner Core (LAMOI)

The Lithosphere Rigid outer layer (crust + top part of mantle) Made of oxygen & silicon Made of moving tectonic plates 60 – 300 km thick

Tectonic Plates Earth’s lithosphere is broken into about 19 pieces These plates move on top of the asthenosphere

The Asthenosphere Semi-solid; solid but flows like liquid, called PLASTICITY Part of Mantle Plates float on this layer; moved by convection currents 250 km thick

The Mesosphere Middle layer of Earth Very strong solid layer Lower part of mantle 2,550 km thick

The Outer Core Liquid layer 4,000 – 5,000 Celsius Made up of nickel & iron 2,200 km thick

The Inner Core Solid, very dense 6,000 Celsius Made up of iron 1,228 km thick Extreme pressure makes it solid even though it is still very hot