Exam 13: Glaciers and Ice Ages

A series of tarn lakes in the valley below a cirque are called __________ lakes.

The most recent ice age occurred during the __________ Epoch.

Continental glaciers occur:

Ground moraines record the extent of continental glaciers of the most recent ice age.

The lower elevation portion of a glacier where less snow is added in winter than melts in summer is called the __________.

The higher elevation portion of a glacier where more snow accumulates in winter than melts in summer is called:

A/an __________ __________ is a section in a glacier consisting of crevasses and towering pinnacles that occur in the upper 50 meters of a glacier as it flows over bedrock.

Alpine glaciers occur only in the Northern Hemisphere.

A/an __________ is a sharp, narrow ridge between two glacial valleys.

The place where glacial flow cannot keep pace with melting is called the __________.

Ice is so much more viscous than water that it sorts particles into various sizes.

__________ is a lithified glacial deposit.

A glacier can move as fast as __________ per day.

A ridge of sediment in the center of an alpine glacier that is formed when two lateral moraines merge is called a __________ __________.

__________ occurs when the Earth's axis circles like a wobbling top.

Crevasses form in the:

Pressure from the weight of overlying ice favors melting at the base.

Much of the northern Great Plains is covered with ground moraine, loess, or outwash.

Glaciers are now shrinking in more places and at more rapid rates than at any time since scientists began keeping records.

The relative rates of basal slip and plastic flow depend on the __________ of the bedrock underlying the glacier and the __________ of the ice.