Exam 13: Climatic Extremes: Deserts and Glaciers

A cirque glacier covers a mountaintop (or low-lying land in the polar regions)completely,and usually displays a radial-outward flow pattern.

Deserts comprise approximately _____ of the world's total land area outside of polar areas.

Land degradation is the invasion of desert conditions into non-desert areas.

When glaciers advance and then retreat,what sort of evidence is left behind to show the extent and nature of the ice cover?

Which of the following is NOT a type of glacier?

A steep-sided desert canyon,as shown,is called a(n)_____.

Depressions in glacial terrains made by left-behind ice are termed _____.

When desert canyons are closely spaced,their flatland deposits often form _____.

Which of the following is NOT a type of desert?

Tundra is the most common type of environment in present-day periglacial regions.

When cirques form on several sides of a mountain,they often form a _____.

The term _____ refers to wind-related processes.

The cryosphereis the perennially frozen part of the hydrosphere.

Deserts,both hot and cold,tend to occur in global zones of _____ dry air.

Most deserts have extensive sand dunes.

_____ is ground that is perennially below the freezing point of water.

In the glacial "ice budget," a zone of snow accumulation is balanced by a zone of _____.

Water erosion rarely occurs in deserts.

An ice deposit formed as a glacier melts and recedes is a(n)_____ moraine.

Land areas which receive between 250 and 500 mm of rain per year are called _____ lands.