Question 1 (10 points) Which of the following is the most accurate and complete

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Question 1 (10 points)

Which of the following is the most accurate and complete expression of what would occur if the continental ice sheets on Greenland and Antarctica melted?

Question 1 options:

Miami goes undersea

Denver goes undersea

New York goes undersea

None of the above

A and C

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Question 2 (10 points)

How could a medial moraine form? A medial moraine is the type that is within the middle portion of the valley (alpine) glacier and that parallels the sides of the glacial valley.

Question 2 options:

by the merging of two lateral moraines at an upstream junction of two valley glaciers

by the merging of two end moraines at the terminus of a valley glacier

by downcutting of two adjacent alpine glaciers to form a sharp linear rock ridge

by flooding of a glacial valley with seawater

none of the above

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Question 3 (10 points)

When a valley glacier retreats, ice flow within the glacier ________.

Question 3 options:

continues to move forward toward the downstream terminus of the glacier

begins to move upstream toward the head of the glacier

stops and becomes stagnant as ice at the terminus melts

is all focused upward as ice at the terminus melts

none of the above

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Question 4 (10 points)

Suppose that a glacier in Alaska receives a record high of snowfall for 10 years in a row. How might this glacier be affected?

Question 4 options:

The flux of ice into the glacier would be less than the flux out, therefore its terminus would recede.

Ablation would increase to balance increased snow accumulation, keeping the glacier in equilibrium.

The snowline (i.e. equilibrium line) would move further down the glacier.

The flux of ice into the glacier would be more than the flux out, therefore its terminus would advance.

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Question 5 (10 points)

Which of the following is a correct relationship between streams and glaciers?

Question 5 options:

Valleys formed from glacial erosion are more U-shaped than valleys formed from streams

Stream sediments are more well sorted than glacial sediments

Worldwide, glaciers contain more freshwater than all the rivers on Earth combined

In straight stretches of streams and glaciers, the velocity of water and ice movement is generally the lowest near the stream bank or glacier edge

All of the above

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Question 6 (10 points)

A glacier retreated in a series of steps. At each step, the glacial terminus remained stable for several years, then retreated rapidly to a new position. What kind of deposits would you expect to see?

Question 6 options:

A sheet of till extending up the valley from the terminal moraine

A series of moraines, progressively younger up the valley

One big lateral moraine

A series of moraines, progressively older up the valley

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Miami goes undersea

Denver goes undersea

New York goes undersea

None of the above

A and C

Explanation / Answer

1) miama goes undersea as there will be increase in the sea level due to ice sheet melting

2) by the merging of two lateral moraines at an upstream junction of two valley glaciers

3) continues to move forward toward the downstream terminus of the glacier

4) The flux of ice into the glacier would be more than the flux out, therefore its terminus would advance.

5) All of the above

6) A Series of moraines progressively younger up the valley

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