A big, flat area of wind-swept sand and dunes. In order for a dune field to be considered an erg, it must have at least about 50 square miles of wind-eroded sand, forming dunes, at least 20% of its surface must be sand. Ergs can be found on other planets, too, such as Venus and Mars.
Answered by
Priyarajan
at
6:55 PM on January 18, 2009