Quiz 3: Erosion and Deposition

What is the largest glacier in North America and where is it?

• Malsapina Glacier, Southeast Alaska

• Bering Glacier, Wrangell-St. Elias Park, Alaska

• Humboldt Glacier, Northwest Greenland

• Hubbard Glacier, Eastern Alaska

Which term refers to material on top of a glacier?

• englacial

• intraglacial

• supraglacial

• topoglacial

Lodgement till

• has been eroded from the underlying rock by the glacier

• is a type of subglacial till

• is deposited as well-compacted, unbedded sediment ranging from several centimetres to many metres in thickness

• all of the above

Lateral and medial moraines are composed of supraglacial sediments deposited when the ice melts

• True

• False

ablation till is material deposited when the ice melts

• True

• False

Which term refers to material within the glacier?

• englacial

• intraglacial

• supraglacial

• topoglacial

Which are true about glaciofluvial sediments?

• They are dominated by silt, sand, and gravel.

• The grains tend to be moderately well rounded.

• Both a and b

• None of these

The existence of kettles, kames and eskers are evidence that a glacier is

• advancing

• stablilizing

• retreating

• none of these. They can occur any time.

The proglacial area is

• the head of a glacier

• the top of a glacier

• the area in front of a glacier

• the maximum length a glacier is expected to reach

a series of beds with distinctive summer and winter layers: relatively coarse in the summer when melt discharge is high, and finer in the winter, when discharge is very low are called

• sandurs

• varves

• outwash plains

• moraines