What are two ways the crust and mantle get the energy needed to cause the motion of tectonic plates?

The energy produced as a result of this flow of electrons from atom to atom is called

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?