Exam 13: Glaciers and Ice Ages

A spoon-shaped depression that was eroded into a mountain peak by a glacier is a(n) ____.

The end, or the foot, of a glacier is the ____________________.

A deposit of windblown glacial silt is called ____.

A series of lakes in a glacial valley that are strung out like beads and connected by short streams and waterfalls are called ____________________.

A(n) ____ is a small lake at the base of a(n) ____.

Currently, Earth has only two ice sheets.

The elliptical shape of Earth's orbit around the Sun is its ____________________.

The lower-altitude portion of an alpine glacier where more snow melts in the summer than accumulates in the winter is called the ____.

The type of glacier movement in which ice flows as a viscous fluid is called ____.

The Snowball Earth hypothesis suggests that during the late-Precambrian, ice completely covered all of the continents, and the world's oceans froze over.

How are paternoster lakes formed?

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

Crevasses form in the ____.

In a plastically flowing alpine glacier, the ____.

The ice sheets of Greenland and Antarctica contain ____ percent of the world's ice.

A sharp, pyramid-shaped rock summit where three or more cirques intersect near the summit is a(n) ____________________.

A(n) ____ is a sharp, narrow ridge of rock between two glacial valleys.

Describe in detail the ice shelf that broke away from Antarctic between 2000 and 2002.

A relatively warm, ice-free, time between glaciations is called a(n) ____.

A ridge of till in the center of an alpine glacier that is formed when two lateral moraines merge is called a(n) ____________________.