Water, wind, ice, and waves are the agents of erosion that wear away at the surface of the Earth.
(Water, wind, ice, and waves; are; the agents of erosion that wear away at the surface of the Earth) (the agents of erosion; wear; away; L:at the surface of the Earth)
Water, wind, ice, and waves the agents of erosion
are wear
the agents of erosion that wear away at the surface of the Earth
away L:at the surface of the Earth