Cracks in the rocks let air and water in. Weathering then goes on inside the rocks as well as on the outside.
(Cracks in the rocks; let; air and water in) (Weathering; goes on; L:inside the rocks as well as on the outside; T:then)
Cracks in the rocks Weathering
let goes on
air and water in
L:inside the rocks as well as on the outside T:then