In order for heat to transfer from one object to another, which must be true?
F The objects must be different sizes.
G The objects must be different
temperatures.
(H The objects must be the same size.
1 The objects must be the same
temperature.

this is poiselle's equation from fluid mechanic in physics. mech eng

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.