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20 True/False questions

  1. Inselbergs are ________.the dry valleys of eastern California and Nevada

          

  2. A ________ is an intermittent stream channel in the dry land areas of the western United States.barchan

          

  3. A ________ is a crescent-shaped dune whose tips point downwind.ventifact

          

  4. Loess deposits in the central United States ________.bedrock hills in a highly eroded desert landscape

          

  5. Deposition of glacial rock flour from blowing winds is responsible for ________.the dry valleys of eastern California and Nevada

          

  6. Assume that the central slip face of a barchan dune slopes downhill toward the east. What is the direction of the prevailing wind?west to east

          

  7. Which of the following characteristics would suggest geologically recent, fault uplift of a desert mountain range?flat, upland surfaces, steep slopes and small alluvial fans

          

  8. Desert and steppe lands cover about what percentage of Earth's land area?by saltation in the first few meters above the land surface

          

  9. ________ refers to the "bouncing" mode of sand transport in a windstorm or stream.Saltation

          

  10. During a typical sandstorm, saltating sand grains reach a maximum height of ________ above the land surface.the dry valleys of eastern California and Nevada

          

  11. ________ have rainfall amounts and soil moisture contents between those of true deserts and humid lands.ventifact

          

  12. How are sand grains transported by the wind?by saltation in the first few meters above the land surface

          

  13. How is desert pavement formed?Runoff and deflation carry off the silt and clay, leaving coarser particles behind.

          

  14. Which one of the following is the one best measure of the wetness or dryness of a region?difference between annual precipitation and evaporation potential

          

  15. Which one of the following statements is correct?Runoff and deflation carry off the silt and clay, leaving coarser particles behind.

          

  16. Most dry lands lie between ________ degrees north and south of the equator.by saltation in the first few meters above the land surface

          

  17. Rainshadow deserts are common in ________.bedrock hills in a highly eroded desert landscape

          

  18. Which of the following best describes the climatic factors that cause low latitude deserts like the Sahara in Africa?Cool, dry air aloft is descending; surface winds are blowing toward the equator.

          

  19. Which one of the following will effectively limit further deflation in a given area?Alluvial fans typically rim desert valleys; playas form in the lowest, interior parts of the valleys.

          

  20. A ________ is formed by abrasion of rocks by windblown sand.barchan