3. which sentence best describes mass movement?
a. the movement of particles within an atom b. the downhill flow of soil and rock resulting from gravity c. the downhill movement of animals due to heavy snow in their normal home d. the steady pace of air bouncing off a mountain

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?