Desert Processes and Landforms MMG + Clicker

Look at question 5 part B for pictures of Dune types

dune types

The force of ________ allows particles to slide down the _______ slope of a dune as it moves.

gravity; leeward

Sediment carried by the wind will drop to the ground when the wind's ________ decreases.

velocity

What is the most important agent of erosion in deserts? -landslides -ice -wind -water -vegetation

water

Look at question 5 part C for pictures of Dune types

dune types

Desert regions occur __________, and always have a(n) __________ climate zone adjacent to them. a. in the rainshadow; equatorial b. in equatorial regions; steppe c. in polar regions; semiarid d. on every continent; humid e. on every continent; steppe

e. on every continent; steppe

Select the statements that are true about wind erosion. (Select the three that apply) -Sediment deposited by wind in deserts can mostly be found in the form of sand dunes and loess deposits. -Wind is most effective as an erosional agent in dry places. -An important erosion-related role of wind in a desert is abrasion of rock surfaces. -Wind erosion happens only in deserts. -Wind is the most important agent of erosion in deserts.

-Sediment deposited by wind in deserts can mostly be found in the form of sand dunes and loess deposits -Wind is most effective as an erosional agent in dry places -An important erosion-related role of wind in a desert is abrasion of rock surfaces

Desert pavement is the result of ________. a. deflation b. erosion by running water c. intense chemical weathering d. abrasion by windblown sand

a. deflation

Most of the desert regions of the world are located: a. near sub-tropical high pressure b. near the equator c. in the western hemosphere d. at 10 degrees N and 10 degrees e. all of the above

a. near sub-tropical high pressure

Deserts that lie outside of the subtropics and mid-latitude belts are most likely the result of __________. a. the presence of a rain shadow b. high water vapor content in the atmosphere c. large-scale atmospheric circulation d. low pressure e. rising, expanding, and cooling air masses

a. the presence of a rain shadow

Crescent-shaped dune with horns pointed downwind is a a. dome dune b. barchan dune c. transverse dune d. linear dune e. star dune

b. barchan dune

When air __________, it is compressed and warmed. a. increases in water vapor b. sinks c. decreases pressure d. rises e. reaches the equatorial low

b. sinks

Precipitation occurs on the __________ of the mountain range, while the __________ is dry. a. leeward side; prevailing wind side b. windward side; leeward side c. west flank; east flank d. leeward side; windward side e. interior basin; coastal region

b. windward side; leeward side

Sand dunes constitute approximately _______% of desert environments a. 80% b. 60% c. 20% d. 100% e. 40%

c. 20%

At what latitudes do the large-scale, convection cells bring dry air downward toward the Earth's surface? a. at the poles b. between 60-70° north and south c. between 20-30° north and south d. 0° e. at the equatorial low

c. between 20-30° north and south

The earth's land surface is comprised of approximately 15% desert: (t/f?)

false

Wind bounces and rolls sand along the ground, a process called?

saltation

Coastal deserts are the driest deserts (t/f?)

true

The force of the _____ pushes particles up the _______ slope of the dune as it moves.

wind; windward