Secondly , plants cause weathering when their roots grow into cracks in rocks and then break them up.
(plants; cause weathering; T:when their roots grow into cracks in rocks and then break them up) (their roots; grow; into cracks in rocks) (their roots; break up; T:then)
plants their roots their roots
cause weathering grow break up
T:when their roots grow into cracks in rocks and then break them up
into cracks in rocks
T:then