Final answer:
External geomorphic processes are mainly subaerial, occurring on the Earth's surface. Examples include wind erosion and glacial carving.
Step-by-step explanation:
External geomorphic processes are mainly subaerial, which means they occur on the Earth's surface, above water. These processes include weathering, erosion, and mass movement caused by elements such as wind, ice, and gravity. Examples of subaerial geomorphic processes include the formation of canyons by the erosion of wind-blown sand, or the carving of valleys by glaciers.