17.1 notes: earth’s m antle & crust
DESCRIPTION
Continental crust Thickness: Continental crust is thicker ( 30-40Km) Age: older (up to 4.4 billion yrs old) Composition : Granite, w/ basalt & diorite beneath Density: L ess dense. 17.1 Notes: Earth’s M antle & Crust. Oceanic Crust Thickness: Thinner (6-11km) - PowerPoint PPT PresentationTRANSCRIPT
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17.1 Notes: Earth’s Mantle & Crust
Continental crustThickness: Continental crust is thicker (30-40Km)
Age: older (up to 4.4 billion yrs old)
Composition: Granite, w/ basalt & diorite beneath
Density: Less dense
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Oceanic Crust
Thickness: Thinner (6-11km)
Age: younger (200 million yrs old)
Composition: basalt gabbro
Density: more dense
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Moho (Mohorovičić discontinuity) Structure: a low pressure & temperature region, so rock becomes more rigid & slows down seismic waves.
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Upper Mantle
Structure: Thin top section w/ extreme pressures. Pressures & temperature increase with depth.
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Lower mantle
Structure: Bottom section has a higher temperature & pressure than upper mantle
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Describe movement between lower & upper mantle:Rock isn’t quite solid here so it moves like a very thick liquid (due to convection).
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