When the moon orbits earth, what is the centripetal force ?

If there were no force of gravity then the moon would tend to travel in a straight line. With gravity providing a centripetal force, that path is curved towards the Earth, resulting in a roughly circular orbit. In essence the moon is in continuous freefall towards the Earth.

Explanation:

The source for the centripetal force in the solar system is the gravitational force of the sun.

a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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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.