Ch. 17 HW

The subtropics

host the world's largest deserts, including the Sahara and Kalahari.

Which sequence in the accompanying diagram correctly matches the name of the sand dune with the appropriate sketch?

1. barchan; 2. transverse; 3. longitudinal; 4. parabolic; 5. star

Which of the following is a desert LEAST likely to have?

a location at 10° N latitude

A 19th-century explorer crossing a desert has run out of water. He has the best chance of surviving if he can find

an oasis

Which of the following describes a type of dune?

barchans

Which of the following is NOT the result of wind erosion?

calcrete

Choose the FALSE statement. Because of typical convection cell movement in the atmosphere

cooled air spreads north and south and its moisture condenses out in latitude zones between 20° and 30° north and south.

All deserts are

dry

Which of the following is a characteristic feature of deserts?

flash floods

Identify the FALSE statement. Deserts can form

in polar regions, because temperatures are so cold.

The Gobi desert, in the interior of Asia, is the largest present-day example of a desert that formed

in the interior of a continent

Choose the FALSE statement. Desertification

is a natural phenomenon; if left alone, Earth's climate fluctuations are minor, and deserts and nondeserts remain constant.

Identify the FALSE statement. Desert varnish

is a product of physical weathering over time, as grains pelt the surface of desert rocks.

The hottest verified Earth temperature, measured at 136°F, was in

libya, Africa

Identify the FALSE statement. Sand dunes

migrate as sand rolls up the lee face of the dune and rolls down the windward side.

Which is NOT a term for a dry-water channel or basin?

mirage

Choose the FALSE statement. Strong winds can

raise large grains, like sand and pebbles, several kilometers high and carry them downwind hundreds of kilometers.

Which term has nothing to do with temporary desert lakes?

reg

Identify the FALSE statement. In the accompanying diagram

the wind is blowing from B to A.

Which type of sand dunes would form where there's abundant sand totally covering the ground surface and only moderate winds?

transverse