Which layers plays the greatest role in the movement of plate tectonics? A) outer core
B) mantle
C) crust
D) inner core

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Which of the following explains why a tree is often used as a model to represent the principle of common descent