tectonic structure Flashcards
1
Q
four layers that make up the earths surace
A
1 crust
2 mantle
3 outer core
4 inner core
2
Q
what is the lithosphere
A
earths crust and solid upper mantle
3
Q
what is athenosphere
A
partially melted
lithosphere floats on top
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)
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)
