earth’s layers
Post on 10-May-2015
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Earth’s LayersEarth’s Layers
CrustCrustOuter most layerOuter most layerThinnestThinnest5 to 100 kilometer (km) 5 to 100 kilometer (km) thickthick
Temperatures range Temperatures range from 0from 0° C to 1000°C° C to 1000°C
CrustCrust Composition: Composition:
mostly silicon, oxygen, mostly silicon, oxygen, sodium, small amounts of sodium, small amounts of magnesium, potassium, magnesium, potassium, and iron.and iron.
CrustCrust
Continental CrustContinental CrustThickest up to 100 km Thickest up to 100 km at mountainsat mountains
Most abundant rock is Most abundant rock is granitegranite
““Two Types”Two Types”
Oceanic CrustOceanic CrustAs thin as 5 kmAs thin as 5 kmMost abundant rock is Most abundant rock is basaltbasalt
Density averages 3g per Density averages 3g per cmcm³³
Crust/MantleCrust/Mantle
Mohorovicic Mohorovicic Discontinuity (Moho):Discontinuity (Moho):Transition boundary Transition boundary between the crust and between the crust and mantlemantle
Crust/MantleCrust/Mantle
Mohorovicic Mohorovicic Discontinuity (Moho):Discontinuity (Moho):This boundary marks a This boundary marks a significant change in significant change in chemical composition.chemical composition.
MantleMantle
67% of Earth’s mass67% of Earth’s mass2,900 km thick2,900 km thickTemperature ranges Temperature ranges from 1000from 1000° C to 3700 ° ° C to 3700 ° C C
MantleMantleDensity averages from Density averages from 4.3g to 5.4g per cm4.3g to 5.4g per cm³³
Composition: mostly Composition: mostly silicon, oxygen, silicon, oxygen, magnesium, and ironmagnesium, and iron
MantleMantleConvection currents Convection currents occur hereoccur here
MantleMantle
Divided into 3 layers: Divided into 3 layers: 1. Lithosphere1. Lithosphere2. Asthenosphere2. Asthenosphere3. Mesophere3. Mesophere
MantleMantle Lithosphere:Lithosphere:
10 to 300 km thick10 to 300 km thickSolid and made up of crust Solid and made up of crust and mantle materialand mantle material
VERY rigidVERY rigidDivided into sections Divided into sections called platescalled plates
MantleMantle
AsthenosphereAsthenosphere250 km thick250 km thickSoft layer that allows Soft layer that allows plates to shiftplates to shift
MantleMantle
MesosphereMesosphere2550 km thick2550 km thickLower part of the Lower part of the mantlemantle
CoreCore
Divided into 2 layers:Divided into 2 layers:1. Outer Core1. Outer Core2. Inner Core2. Inner Core
CoreCoreOuter CoreOuter Core
LiquidLiquid2200 km thick2200 km thick
CoreCore
Outer Core:Outer Core:Composition: Iron and Composition: Iron and Nickel, 10% sulfur and Nickel, 10% sulfur and oxygenoxygen
CoreCoreOuter Core:Outer Core:
Density: 10g to 12g Density: 10g to 12g per cmper cm³³
Temperature: 4000° to Temperature: 4000° to 5000° C5000° C
CoreCoreInner Core:Inner Core:
SolidSolid1230 km thick1230 km thickAbout 6380 km About 6380 km beneath Earth’s surfacebeneath Earth’s surface
CoreCore Inner Core:Inner Core:
Composition: Iron and Composition: Iron and NickelNickel
Density: 15 g per cmDensity: 15 g per cm³³Temperature: 5000° to Temperature: 5000° to 6000° C6000° C
Earth’s LayersEarth’s LayersScientists use indirect Scientists use indirect methods to gain methods to gain information and information and knowledge of Earth’s knowledge of Earth’s interior (example: interior (example: earthquakes).earthquakes).
Earth’s LayersEarth’s LayersSeismic waves from Seismic waves from earthquakes travel at earthquakes travel at different speeds depending different speeds depending on the density and on the density and composition of the ground composition of the ground they move through. they move through.
Earth’s LayersEarth’s Layers
Scientists are able to Scientists are able to take this information take this information and learn about the and learn about the interior of Earth.interior of Earth.
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