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21 True/False questions

  1. desert varnishA mosaic-like stone surface forming the ground in a desert.

          

  2. saltationThe process of lowering the land surface by wind abrasion.

          

  3. mesaA large, flat-topped hill (with a surface area of several square kilometers) in an arid region.

          

  4. suspended loadTiny solid grains carried along by a stream without settling to the floor of the channel.

          

  5. dry washThe channel of an ephemeral stream when empty of water.

          

  6. surface loadTiny solid grains carried along by a stream without settling to the floor of the channel.

          

  7. cliff retreatA surface accumulation of coarser sediment that forms where wind has blown away finer sediment.

          

  8. ventifactA desert rock whose surface has been faceted by the wind.

          

  9. pedimentThe broad, nearly horizontal bedrock surface at the base of a retreating desert cliff.

          

  10. chimney(1) A conduit in a magma chamber in the shape of a long vertical pipe through which magma rises and erupts at the surface; (2) an isolated column of strata in an arid region.

          

  11. rain shadowThe inland side of a mountain range, which is arid because the mountains block rain clouds from reaching the area.

          

  12. desertificationThe process of transforming nondesert areas into desert.

          

  13. ButteA medium-sized, flat-topped hill in an arid region.

          

  14. alluvial fanA gently sloping apron of sediment dropped by an ephemeral stream at the base of a mountain in arid or semi-arid regions.

          

  15. inselbergA region so arid that it contains no permanent streams except for those that bring water in from elsewhere, and has very sparse vegetation cover.

          

  16. deflationThe process of lowering the land surface by wind abrasion.

          

  17. talus apronA wedge-shaped pile of rock fragments that accumulates at the base of a cliff.

          

  18. desert pavementA mosaic-like stone surface forming the ground in a desert.

          

  19. lag depositA surface accumulation of coarser sediment that forms where wind has blown away finer sediment.

          

  20. playaThe flat, typically salty lake bed that remains when all the water evaporates in drier times; forms in desert regions.

          

  21. desertA region so arid that it contains no permanent streams except for those that bring water in from elsewhere, and has very sparse vegetation cover.