Barchans are crescent-shaped dunes, stars are star-shaped dunes, and parabolic dunes are U-shaped dunes.

Playas are formed when a lake dries up, leaving behind a flat, dry surface.

Regs are formed when wind and water erode the surface of a desert, leaving behind a pavement of small, smooth stones.

Wadis are formed when water flows through a desert during a rainstorm, creating a temporary riverbed.

Mesas are flat-topped mountains, buttes are smaller, isolated mountains, and canyons are deep, narrow valleys.

Pediments are formed when wind and water erode the base of a mountain, creating a gently sloping plain.

Aridisols are soils that are found in deserts and are characterized by their low water content and high salt content.

Desert varnish is formed when iron and manganese oxides are deposited on rocks by wind and water.

Cacti, yuccas, and Joshua trees are all types of desert plants that are adapted to the dry conditions of the desert.

Camels, scorpions, and lizards are all types of desert animals that are adapted to the dry conditions of the desert.

Hot deserts, cold deserts, and coastal deserts are all types of desert ecosystems that are characterized by their dry conditions.

The Sahara Desert is the largest desert in the world, covering an area of over 9 million square kilometers.

Arid, semi-arid, and hyper-arid are all types of desert climates that are characterized by their low precipitation.

The Atacama Desert is the driest desert in the world, with an average annual precipitation of less than 1 millimeter.

Sand dunes, playas, and desert pavements are all types of desert landforms that are formed by the erosion of wind and water.