Erosion - the incorporation and transportation of material by mobile agents such as water, wind, or ice. Weathering occurs when rock is mechanically fragmented or chemically altered at or near the earth's surface.
(Weathering; occurs; T:when rock is mechanically fragmented or chemically altered at or near the earth's surface) (rock; is; mechanically fragmented or chemically altered at or near the earth's surface) (rock; chemically altered; L:at or near the earth's surface)
Weathering rock rock
occurs is chemically altered
T:when rock is mechanically fragmented or chemically altered at or near the earth's surface
mechanically fragmented or chemically altered at or near the earth's surface
L:at or near the earth's surface