Geology Cafe

Introduction to Geology

Quiz 13 - Deserts
1. Semiarid regions that often surround deserts are called:
a. tundra.
b. plains.
c. plateaus.
d. steppe.
e. piedmont.

2. Dry regions comprise approximate what percent of Earth's land area?
a. 1
b. 5
c. 10
d. 30
e. 50

3. Streams that are usually dry are called:
a. playas.
b. effluent.
c. alluvial.
d. ephemeral.
e. base level.

4. What is responsible for most erosion in deserts?
a. wind.
b. running water.
c. glaciers.
d. plants and animals.
e. groundwater.

5. Why are most middle-latitude deserts located where they are?
a. They coincide with zones of subtropical highs.
b. No rivers run through them.
c. They are far removed from oceans.
d. They receive too much sunlight.
e. All of the above.

6. Mountain ranges that may block precipitation from reaching certain areas, creating:
a. rainshadows.
b. alluvial fans.
c. subtropical highs.
d. playas.
e. inselbergs.

7. Desert land features created by water include all of the following except:
a. alluvial fans.
b. playas.
c. inselbergs.
d. bajadas.
e. dunes

8. Which of the following constitutes most of the bed load carried by wind?
a. boulders
b. sand
c. soil
d. fine dust particles
e. pebbles

9. Which type of desert erosion consists of the lifting and removal of loose material?
a. ventifact
b. deflation
c. varnish
d. pavement
e. abrasion

10. The largest arid region in North America is:
a. the Sonoran Desert.
b. the Chihuanhuan Desert.
c. the Colorado Desert.
d. the Mojave Desert.
e. the Colorado Plateau.

Extra Credit: Loess is:
a. found in areas downwind of deserts and glacial outwash plain regions.
b. an extensive blanket of silt.
c. sediment that was carried in suspension by wind.
d. all of the above.