Which answer accurately describes the difference between speed and velocity a. speed can be constant or it can change. velocity is always constant b. speed requires direction. direction doesnt matter when calculating velocity c. speed is the distance per unit of time. velocity is the displacement per unit of time d. speed is the same as average velocity. velocity is used to calculate acceleration.

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.