The force of is the force at which the earth attracts another object towards itself.
a. inertia
b. friction
c. gravity
d. momentum

Correct answer choice is:

C) gravity

Explanation:

Gravity is a force of attraction that endures within any two bodies, any two groups, any two particles. Gravity is not just the attraction among objects and the Earth. Gravity is a force pulling mutually all matter. The longer matter, the more gravity, so things that have a lot of material such as planets and moons and stars pull more firmly. Mass is how we estimate the amount of matter in something.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.