Exam 4: Glacial and Arid Landscapes

A landscape dominated by U-shaped valleys and pyramid-shaped mountains is most likely formed due to ________.

If accumulation exceeds ablation in a glacial budget, which of the following will happen?

The ________ region of the United States is depicted in this image.

Under typical conditions, glaciers flow ________.

Match the landscape feature with the material from which it is formed. A)till B)outwash C)solid rock -13)glacial erratic 14)cirque 15)esker 16)horn 17)drumlin 18)moraine

Glaciers are powerful agents of erosion and deposition, and during the Quaternary Ice Age, these flowing masses of ice reshaped much of the North American continent. Discuss three of the effects of Ice Age glaciers that are NOT related to erosion or deposition.

Moraines are the only glacial deposits composed of till.

A(n)________ a thick, flowing ice mass that forms over hundreds or thousands of years.

Bajadas develop when multiple alluvial fans grow and merge along the fronts of mountain ranges in arid lands.

Deflation may lead to ________.

Melting and calving are two forms of accumulation.

By the year 2030, it is possible that Glacier National Park in Montana will not have any ________.

A(n)________ is a cone of debris that forms where an ephemeral stream emerges from the confines of the canyon. Its runoff spreads over the gentler slopes at the base of the mountains and quickly loses velocity, dumping most of its sediment load within a short distance.

About what percentage of Earth's land surface is covered by deserts?

Desert regions that exhibit a discontinuous pattern of ephemeral streams that do not flow out of the desert to the ocean are said to have a(n)________.

________ are erosional features produced by valley (alpine)glaciers.

Which of the following is NOT a variety of moraine?

Wind is included along with gravity, water, and ice as an agent of erosion. In many national parks and other areas of natural beauty, statements are often made that credit wind as having sculpted the landscape. Briefly discuss the importance of wind as an agent of erosion and explain why such statements are probably geologically inaccurate.

________ is drier than steppe.

Examine the satellite image of Death Valley, California. (a)What province of the United States is it located within? (b)Identify the various desert landforms seen there, circle and label them, and (c)describe how each one forms. Finally, (d)describe the sequence of events to that produced this scene over time.