The main constituent of desert sand is usually quartz crystals.
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Q131: Dunes are rarely associated with vegetation.
Q132: The fastest moving of all types of
Q133: Many of today's loess deposits date from
Q134: Drainage networks of arid lands are frequently
Q135: Desert stream channels contain plentiful rock debris.
Q137: The seif is the most common type
Q138: Loess is associated with high agricultural fertility.
Q139: Much loess deposition in eastern Asia resulted
Q140: Approximately 5 percent of all desert streams
Q141: Pediments are often covered with a veneer
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