A( would be found at the mouth of a river where fresh and salt water meet.

Salutations!

A(n) would be found at the mouth of a river where fresh and salt water meet.

A(n) estuary would be found at the mouth of a river where fresh and salt water meet. The result of fresh water mixing with the salt water is called barckish water. Estuary is where the river meets sea, and sea is where you find salty water.

Hope I helped :D

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”

Brand c i think that should be it