The following sentences contain blanks. Use the drop-down menus to complete each blank correctly. The [Dropdown 1] Desert covers most of North Africa and is the largest hot desert in the world. Much of the landscape consists of [Dropdown 2] , with many plains, ridges, and cliffs. In contrast, the [Dropdown 3] is the sandiest desert in the world, with many sand dunes. It meets the [Dropdown 4] to the north. Located in [Dropdown 5] , the [Dropdown 6] is known as the Great Salt Desert because of its many salt crusts.