Chemical weathering is when the rock is chemically attacked: An example of this is the breakdown of limestone by acid rain .
(the rock; is chemically attacked; ) (An example of this; is; the breakdown of limestone by acid rain) Context(An example of this is,List([61, 82))):(Chemical weathering; is; when the rock is chemically attacked)
An example of this is,List([61, 82))
the rock An example of this Chemical weathering
is chemically attacked is is
the breakdown of limestone by acid rain
when the rock is chemically attacked