earth's structure

Earth’s Structure Chapter 4

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Earth’s StructureChapter 4

Earth’s Interior

0Made up of 3 major compositional zones and 5 structural zones.

Compositional Zones

0Crust: outermost layer0Makes up 1% of Earth’s mass0Oceanic (5-10km) & continental

(15-80km)0Moho: lowest layer of crust

Compositional Zone

0Mantle: denser than crust02,900 km thick (2/3 of Earth’s

mass)0Core: center of the Earth0Made of iron and nickel

Structural Zones

03 compositional zones are divided into 5 structural zones.

0Lithosphere: Part of the mantle & crust above it.0Cool & brittle

0Asthenosphere: Solid rock is able to flow. 0Very hot and has high pressure

0Mesosphere: Layer of solid mantle rock0Outer core (liquid)0Inner core (solid)

Earth as a Magnet

0Has 2 magnetic poles0Motions in the core produce electric

currents that create magnetic field.0Shaped by solar winds

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