Exam 6: Glaciers, deserts, and Wind

In recent years there has been more discussion of droughts in places like eastern Texas,which is not considered a desert,than in southern Arizona which clearly is a desert.Does this mean that arid environments are changing and it would be better to invest in farm land near Phoenix,Arizona,than near Austin,Texas,for long term financial security?

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Question 1

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It probably is not a good idea to assume that southern Arizona will not be a desert in the future and that eastern Texas will become a desert.Eastern Texas is less prepared to deal with short term climate fluctuations than southern Arizona because the climate has been relatively stable for almost a century and during that time southern Arizona has been arid and has adapted to that environment.It is likely that eastern Texas will learn to adapt if the climate persists in becoming more arid there.

Would most features of alpine glaciation be preserved in the geologic record? Why or why not? What about continental glaciation?

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Alpine glaciation would not be preserved because weathering attacks the highest point on the landscape,therefore the tops of mountains are constantly eroded by myriad forces.These forces would remove evidence of past alpine glaciations.Continental glaciation would leave depositional features as the glaciers recede,therefore there would be evidence of this type of glaciation.

horn arête lateral moraine drumlin

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drumlin

Deposits of windblown silt are called ________.

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Question 4

A playa is an intermittent lake on the floor of a desert valley.

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Question 5

If you fall into a crevasse,what is the maximum depth you are likely to fall?

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Question 6

The Colorado River is an example of a large wash.

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Question 7

A(n)________ represents a former meltwater channel or tunnel in glacial ice that was filled with sand and gravel.

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Question 8

Glacial sediments or tills are characterized by ________.

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Question 9

Explain why crevasses only penetrate partway through a glacier.What limits their depth?

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Question 10

What is the name for the very large pluvial lake that once existed in northwestern Utah?

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Question 11

Desert and steppe lands cover about what percentage of Earth's land area?

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Question 12

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.

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Question 13

Milankovitch cycles are used to explain the cycles of cold and warm climates that characterized the Ice Ages based on ________.

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Question 14

Which of the following is not a major factor controlling glacial erosion?

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Question 15

Permanent streams in desert regions are rare,and when they do occur,________.

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Question 16

Moraines are the only glacial deposits composed of till.

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Question 17

Which letter,S thru Z,corresponds to the object in the photo labeled "D"?

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Question 18

Glacial ice sheets are the largest glaciers and they currently cover ________.

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Question 19

Windblown loess,like sand,typically accumulates as mound-like dunes.

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Question 20

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Exam 6: Glaciers, deserts, and Wind

Would most features of alpine glaciation be preserved in the geologic record? Why or why not? What about continental glaciation?

horn arête lateral moraine drumlin

Deposits of windblown silt are called ________.

A playa is an intermittent lake on the floor of a desert valley.

If you fall into a crevasse,what is the maximum depth you are likely to fall?

The Colorado River is an example of a large wash.

A(n)________ represents a former meltwater channel or tunnel in glacial ice that was filled with sand and gravel.

Glacial sediments or tills are characterized by ________.

Explain why crevasses only penetrate partway through a glacier.What limits their depth?

What is the name for the very large pluvial lake that once existed in northwestern Utah?

Desert and steppe lands cover about what percentage of Earth's land area?

Milankovitch cycles are used to explain the cycles of cold and warm climates that characterized the Ice Ages based on ________.

Which of the following is not a major factor controlling glacial erosion?

Permanent streams in desert regions are rare,and when they do occur,________.

Moraines are the only glacial deposits composed of till.

Which letter,S thru Z,corresponds to the object in the photo labeled "D"?

Glacial ice sheets are the largest glaciers and they currently cover ________.

Windblown loess,like sand,typically accumulates as mound-like dunes.

Introduction to Earth Science

Matter and Minerals

Rocks: Materials of the Solid Earth

Weathering, soil, and Mass Wasting

Running Water and Groundwater

Plate Tectonics: a Scientific Revolution Unfolds

Earthquakes and Earths Interior

Volcanoes and Other Igneous Activity

Crustal Deformation and Mountain Building

Geologic Time

Earths Evolution Through Geologic Time

The Ocean Floor

Ocean Water and Ocean Life

The Dynamic Ocean

The Atmosphere: Composition,structure,and Temperature

Moisture, clouds, and Precipitation

Air Pressure and Wind

Weather Patterns and Severe Weather

World Climates and Global Climate Change

Origin of Modern Astronomy

Touring Our Solar System

Light,astronomical Observations,and the Sun

Beyond Our Solar System

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