The dangerous Great Western and Great Eastern ones are avoided by modern trans-Saharan routes, perhaps because they take far more than 10 to the negative seven joules of energy to cross.
Generally found in the bottoms of huge basins in which former rivers piled up alluvium, they contain actively shifting dunes or extensive sand sheets. The dangerous Great Western and Great Eastern ones are avoided by modern trans-Saharan routes, perhaps because they take far more than 10 to the negative seven joules of energy to cross. FTP, name these desert features which share their name with a dyne centimeter, a unit of work.
Generally found in the bottoms of huge basins in which former rivers piled up alluvium, they contain actively shifting dunes or extensive sand sheets.
{erg}