tectonic structure

Question 1

four layers that make up the earths surace

Answer 1

1 crust
2 mantle
3 outer core
4 inner core

Question 2

what is the lithosphere

Answer 2

earths crust and solid upper mantle

Question 3

what is athenosphere

Answer 3

partially melted

lithosphere floats on top

Question 4

oceanic crust

Answer 4

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

Question 5

continental crust

Answer 5

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