Exam 19: Glaciers and Glaciation

The down-valley part of a glacier is the ____,where melting,evaporation,and calving take place.

A(n)____ is a long sinuous ridge of water-deposited cross-bedded and well-sorted sediment deposited by a stream that flowed within or under a glacier.

The two types of glaciated terrain on the Earth's surface are alpine and valley.

Once a glacier is gone the land begins to uplift slowly to its pre-glacial height,a process called ____.

If all ice sheets were to melt,sea level would _____.

The _____ is the end of a glacier.

What caused the glacial ages?

Where glaciers exist they are far more effective agents of erosion,transportation,and deposition than running water.

A glacier will flow faster where it is steeper and _____.

Two layers of sediment resulting from one year's deposition in a glacial lake are called ___.

The boundary between the zone of accumulation and the zone of ablation is an irregular line called the _____.

A(n)___ is a lake occupying a bedrock depression excavated by a glacier.

Sharp ridges called ___ separate adjacent glacially carved valleys.

Glaciers in temperate climates may have crevasses that extend to their base.

A large trunk glacier erodes downward more rapidly and carves a deeper valley than do smaller tributary glaciers.

As ice retreats by melting back,the rock debris carried by the glacier is deposited to form a relatively thin layer of till called a(n)___________.

An esker is a long sinuous ridge of ice.

A(n)_______ is a mass of ice that is not restricted to a valley but covers large areas of land.

Under the influence of gravity a glacier moves down valley and eventually __.

Support is growing for the idea that a late Precambrian ice sheet was so extensive that the surface of the world ocean was frozen.