Read the following selection from the section "Energy Can Change Form."
The ball's kinetic energy is changed
into heat by the opposing force of
friction. Friction is the force resisting
objects sliding against each other.
The ball stops at the bottom of the
hill because friction transforms all its
kinetic energy into heat. As with
energy transfers, the amount of
energy stays the same in
transformations.
Based on this selection, choose the statement
that is TRUE.

positive reinforcement? ?

a and c

c is 100% but i am confused in a

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.