Weathering: When rocks and other substances on the earth's surface break down, the process of weathering is at work.
(rocks and other substances on the earth's surface; break down; ) (the process of weathering; is; at work; T:When rocks and other substances on the earth's surface break down)
rocks and other substances on the earth's surface the process of weathering
break down is
at work T:When rocks and other substances on the earth's surface break down