4 Inner Core Solid, innermost layer of Earth Hottest part of the Earth ( oC ,000oF)The inner core experiences the greatest amount of pressure, so it’s solid.Dense and comprised mostly of iron and some nickel1250 km thickDensity g/cm3
5 Outer Core Beneath the mantle Inner and Outer Core are 1/3 of the earth’s massfluid outer core made of nickel and ironouter boundary lies approximately 2,890 km beneath Earth’s surfacethe iron in the outer core generates Earth’s magnetic fieldkm thicko CDensity g/cm3
6 Mantle is very hot part melted and part solid iron and magnesium The region just below the crust and extending all the way down to the Earth's coreis very hotpart melted and part solid iron and magnesiumIt is relatively flexible so it flows instead of fracturing2800 km thick- thickest layer1400oC – 3000oC- cooler at the top of the layer and gets hotter as it goes deeperDensity- 4.5 g/cm3
7 is the outer layer of the mantle Asthenosphereis the outer layer of the mantlesolid rock that flows slowly (like hot asphalt)Lies between 100 and 200km below Earth’s surfaceInvolved in plate movement- lithospheric plates “float” on itConvection currents circulate heat from the core- heated “liquid” rises and cooler “liquid” falls
8 Crust Thinnest layer; density 3 g/cm3 The Earth's outermost layer of the 4 main layersThe crust is typically about km thick beneath continents, and about 10 km thick beneath oceans.made of soil, water and rockThe crust is relatively light and brittle.Most earthquakes occur within the crust.Temperature 0oC – 400oCWhere volcanic magma eruptsThe crust in this image is much smaller in the real earth!LithosphereContinental crust- landOceanic crust- under water
9 LithosphereIs made up of the Crust and the uppermost part of the mantlerigid outer layerBroken into 30 sections or platesTwo types:Oceanic lithosphere, which is associated with Oceanic Crust and exists in the ocean basinsContinental lithosphere, which is associated with Continental Crust
12 Questions On a piece of paper answer the following questions. The planet we call Earth has how many main layers?What layer is farthest from where we stand?Which layer has the highest temperature?Which layer has convection currents?Which layer is broken into plates?
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