Exam 12: Glaciers and Glaciation

____ are landscape features that indicate a mountainous area has been glaciated.

___ moraines are elongate low mounds of till that form along the sides of valley glaciers.

A U-shaped valley (in cross section) is characteristic of glacial erosion.

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

Glaciers in temperate climates tend to move slower than those in colder regions.

If a moving glacier reaches a body of water ______ float free.

A(n) _____ is the sharp peak that remains after cirques have cut back into a mountain on several sides.

An end moraine marks the final edge of a receding glacier just before the glacier melts away entirely.

The _____ is the end of a glacier.

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

Glaciers with a positive budget are advancing glaciers.

A(n) ______ is a steep-sided half-bowl shaped recess carved at the head of a mountain glacial valley.

Tillite is lithified till.

When an ice block that was buried in sediment finally melts a depression called a ___ forms.

The grinding of rock against rock by a glacier produces a very fine sediment called ____.

___ are the product of past glaciations.

A(n) _____ is a coastal inlet that is formed by a drowned glacial carved valley.

The theory of _____ states that at times in the past, colder climates prevailed during which much more of the land surface was glaciated than at present time.

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.

Above the rigid zone, glacial ice movement is due to __.