Rockslide derbis is a type of rock debris that is created when rocks slide down a steep slope. It is composed of small pieces of rock that have been broken off from larger rocks due to the force of gravity and the movement of the rocks. SCREE is a type of rockslide derbis that is made up of smaller pieces of rock, usually less than 2.5 centimeters in diameter. It is often found at the base of cliffs or mountains and can be used to help stabilize slopes.