Roughly half of U.S wetlands are located along the Gulf Coast and serve as critical habitat for 75 percent of migratory waterfowl entering the country.
Etching is traditionally the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio (relief) in the metal.In modern manufacturing, other chemicals may be used on other types of material.tching is traditionally the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio (relief) in the metal.
etching. 1. A process in which a special needle is used to draw a design on a metal plate overlaid with wax. The plate is then treated with acid, inked, and finally used to print reproductions of the design.tching. 1. A process in which a special needle is used to draw a design on a metal plate overlaid with wax. The plate is then treated with acid, inked, and finally used to print reproductions of the design.