An atoll estuary serves as the term that used in referring to rising of sea level which do results to invasion of the river valley which produces a nearshore body of water of mixed as well as variable salinity.
In an estuary, there us usually mixing of freshwater river or stream aa well as ocean.
This will result to<u> salty ocean</u> mixing with a freshwater river, and brackish water will be formed.
C) The Marianas, Oregon and Washington have had the sea floor bent downward by subduction to make trenches, the trench off Oregon and Washington is filled by sediment eroded from the nearby continent, but the Marianas don't have a nearby continent and so the trench there is not filled with sediment.
