Exam 19: Glaciers and Glaciation

Unsorted and unlayered rock debris carried or deposited by glaciers is called till.

Two layers of sediment representing one year of deposition in a lake are called a varve.

The longest ice core drilled was obtained at ____,Antarctica,in the 1990s.

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

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

During the most recent ice age,sea level was at least 100 meters lower than at present.

Tillite is lithified till.

Glaciers with a positive budget are advancing glaciers.

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

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

The central portion of a valley glacier moves _____ the sides.

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

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

The thicker part of a glacier will flow slower than where it is thinner.

Glaciers can be considered as _______ of fresh water for future use.

______ gives us more evidence of the beginning and ending times of glacial episodes than the direct study of glacial deposits.

The sediment deposited by debris-laden melt water is called _______.

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

______ first suggested that glacial/interglacial episodes are related to variation in solar radiation cycles.

If the terminus of a glacier remains stationary for a few years a distinct _______ may form.