Which sentence correctly describes a friction force? a. it acts in the same direction as the motion of an object. b. it acts in a direction opposite to the motion of an object. c. it acts in the same direction as the force of gravity on an object. d. it acts in a direction perpendicular to the motion of an object.

B

Explanation:

Friction acts in a direction opposite to the motion of an object

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods