What is the main source of downward convection movement in the mantle?
a. ridge-pull
b. ridge-push
c. slab-push
d. slab-pull

Which summarizes the relationship between density of an element and its distribution in earth? a. the greater an element’s density, the greater the amount of it found in the crust. b. the denser an elements is, the smaller the amount of it earth core. c. the greater an elements density, the smaller the amount of it’s found in the crust

Answer this asap. why did the americans go to china? a. trading b. exploration c. land d. live stock

What is the thickest layer of earth called?