The remaining surfaces of arid lands are composed of exposed bedrock outcrops, desert soils, and fluvial deposits including alluvial fans, playas, desert lakes, and oases.

• 其余干旱陆地表面由裸露的岩层、沙漠土、河流沉积物包括冲积扇面、洼地、沙漠中的湖泊、和沙海组成。