This document defines terrestrial motion as the movement of the Earth. It explains that terrestrial means "of the Earth" while extraterrestrial means emerging from a UFO. Motion is defined as a change in an object's position over time, usually described using displacement, distance, velocity, acceleration, time and speed. The document outlines three types of terrestrial motion: motion with respect to quality such as alteration; motion with respect to quantity such as increase or decrease; and motion with respect to place, also known as locomotion.