Are marsh's polluted?

Question

Are marsh's polluted?

Answer 1

Some are, some are not. It all depends on the presence of pollution. Here's how to tell: If pollution is present in the marsh, the marsh is polluted. If there is no pollution present in the marsh, the marsh is not polluted.

Answer 2

A wetland works as a water filter.  If the water flowing through a wetland is dirty, the heavy metals and other impurities will be filtered through it.

It is imortant to protect a wetland because of the important role it plays in keeping our rivers clean.