tectonic structure Flashcards

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1
Q

four layers that make up the earths surace

A

1 crust
2 mantle
3 outer core
4 inner core

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2
Q

what is the lithosphere

A

earths crust and solid upper mantle

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3
Q

what is athenosphere

A

partially melted

lithosphere floats on top

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4
Q

oceanic crust

A

thinner than continental crust averaging between 3 and 10km
made up of heavy rock and basalt
made up of silica and magnesium (SIMA)

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5
Q

continental crust

A

thick averaging between 30km and 70km in thickness
made up of light rock eg granite
made up of silica and alluvium (SIAL)

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