continental glaciation video

continental glaciation video

Within this alpine glacier, several depositional features are evident. Most notable are the various moraines found along (lateral), among or between (medial) and at the end (terminal) of the glacier. Morainesconsist of unsorted till (diamicton or sediment) that is deposited with glaciers; the location of the moraine determines the type. Three of the most well-known moraines are:
Double‑click and select letters F, G, and H individually to identify the following features:

Question 17:Feature :

A. Medial moraine

B. Terminal moraine

C. Lateral moraine

D. Recessional moraine

Question 18:Feature :

A. Medial moraine

B. Terminal moraine

C. Lateral moraine

D. Recessional moraine

Question 19:Feature

A. Medial moraine

B. Terminal moraine

C. Lateral moraine

D. Recessional moraine

Collapse and uncheck ALPINE GLACIATION.

Continental Glaciation

During glacial periods in the past, large portions of North America were cover by continental glaciers. Today, these glaciers are found predominantly in Greenland and the Antarctica. But remnants of continental glacier activity can be found across much of Canada,the northern continental US, northern Europe and Russia.

Expand and clickCONTINENTAL GLACIATION. Click continental glaciation video in the window. This animation depicts marginal landforms of continental glaciers.

As you can see, it is the depositional features of continental glaciations that remain on the landscape.These features include those that formed under or as a result of glacial lobes while other features are a result of glacial meltwater.

ExpandDepositional Features.

Drumlins are created by continental glaciers that reshape previous deposited glacier material as they move over it (Figure 4).They tend to be elongated and orient in the direction of ice movement. The blunt end of a drumlin faces the direction from which the glacier was moving when it created the drumlin.

Figure 4.Topographic representation of a drumlin and its direction of glacial ice flow.

Double-click Drumlin.

This is a landscape with several drumlins. From the air it is difficult to see them; however, it becomes more obvious when contour lines are added to show elevation changes.

Set the elevation exaggeration to 3.

Select Drumlin Contour.

Look for a series of contour lines forming an elongated shape similar to Figure 4. This feature is a drumlin.

Double-click and select Drumlin Oblique View to see an oblique view of the feature.

Question 20: According to the shapes of the drumlins, what (compass) direction do you think the ice was moving when it formed the drumlins?





Double-click and select Kettle Lake.

This large circular body of water is a kettle lake formed by a block of ice a retreating glacier falling off. Over time the block of ice is partially buried and then melts to create a depression.When filled with water, this depression is termed a kettle lake. Use the ruler tool and measure the distance across the lake from point H to point I.

Question 21: How wide, in miles, is the lake (from H to I)?

A. 1.6 miles

B. 2.6 miles

C. 3.6 miles

D. 4.6 miles

Question 22: Assuming the lake is circular, calculate the area of this lake (A=πr2)in square miles, where A is area, pi is 3.14, and r2 is the radius of the circle squared.

Area is __________________mi2

A. Π(0.8)2 = 2.00 square miles

B. Π(1.6)2 = 8.04 square miles

C. Π(3.6)2 = 40.72 square miles

D. Π(4.6)2 = 66.48 square miles

ExpandEskers. Select Ripley Esker.

Eskers are long snake like ridges created by the deposition of sediment frommelt water streams that flowed within or under glaciers. Gravel pits often mine eskers for sand and gravel.

This is the Ripley Esker in Minnesota. Notice how the trees delineate the esker.

Select Belle Prairie.

You can use the following Google Earth tools to make the esker easier to see on the topographic maps:

· Use the Adjust Opacity tool to see how the topographic map compares to the aerial photograph.

· Use the Ruler tool to compute the length of the esker.

Question 23: What is the approximate length of the esker in miles?

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