Glaciers

The photograph shows both erosional and depositional features formed by an agent of erosion. Which agent of erosion produced the features shown in the photograph?

• running water

• glacial ice

• ocean waves

• prevailing wind

The photograph shows scratched and grooved

bedrock with boulders on its surface. The scratches and grooves were most likely created when

• alternating thawing and freezing of water cracked the bedrock

• flooding from a nearby lake covered the bedrock

• a glacier dragged rocks over the bedrock

• rocks from a landslide slid along the bedrock

The photograph shows a valley. Which agent of erosion most likely produced this valley's shape?

• blowing wind

• ocean waves

• moving ice

• running water

The cross sections show a three-stage sequence in the development of a glacial feature. Which glacial feature has formed by the end of stage 3?

• kettle lake

• finger lake

• drumlin

• parallel scratches

Base your answer to the following question on the map. Arrows on the map show the location and orientation of glacial striations on the surface bedrock. Dark shading shows the location of large moraines (glacial deposits). How were the striations made?

• Frost action cracked the bedrock during the ice age.

• Rocks at the bottom of the glaciers were dragged over the bedrock.

• Particles carried by winds scratched the bedrock during the ice age.

• Particles carried by glacial meltwater eroded the bedrock.

Which landscape feature was most likely formed by glacial activity?

• an eroded plateau

• a flat floodplain

• a U-shaped valley

• a V-shaped valley

The bedrock at a certain location is deeply scratched, and in some places is covered by a layer of unsorted sediment. Which erosional agent was probably responsible for these features?

• ocean waves

• wind

• running water

• glaciers

Base your answer to the following question on the diagram which represents a profile of a mountain glacier in the northern United States. Over a period of years, this glacier gains more snow mass than it loses. What will be the most likely result of this gain?

• The glacier will decrease in size, and the ice front will retreat.

• The glacier will decrease in size, and the ice front will advance.

• The glacier will increase in size, and the ice front will retreat.

• The glacier will increase in size, and the ice front will advance.

The diagram represents a stream valley. Which diagram below best shows how this valley might be modified after a glacier has moved through it?

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The diagram shows the edge of a continental glacier that is receding. R indicates elongated hills. The ridge of sediments from X to Y represents a landscape feature. The elongated hills labeled R are most useful in determining the

• age of the glacier

• direction the glacier has moved

• thickness of the glacier

• rate at which the glacier is melting