Exam 14: Snow Into Ice--The Basis of Glaciers

The presence of meltwater at the bottom of a glacier can increase its rate of movement.

The presence of till indicates

The snowline is at a higher elevation on equatorial mountains than on midlatitude mountains.

Thawing of permafrost could create a positive feedback loop as vast amounts of carbon are released into the atmosphere,further amplifying warming.

During a surge,a glacier moves up to 2 km/hr.

Unfrozen ground in a region of discontinuous permafrost is known as

Surprisingly,there are no ice caps in Iceland.

Elongated hills,often in the shape of a bowl of an inverted spoon,streamlined in the direction of glacial movement,are called

The process of calving produces

The zone where accumulation balances ablation is known as the

Describe the process by which snow becomes glacial ice.

Melting on the surface,internally,and wind deflation,calving,and sublimation at the base,are examples of ablation.

Glacial ice can form during the duration of a single winter season in most glacial areas.

The expansion and contraction of frost action results in the movement of soil particles,stones,and small boulders into distinct shapes know as

The albedo of the Greenland Ice Sheet has decreased over the past decade due to ice sheet darkening.

If a glacier does not have debris embedded in its base,then it is not a very effective agent of abrasion.

A talik connects the surface to groundwater in discontinuous permafrost.)

Periglacial environments are likely to occur in which of the following climate types?

Glacial surges may be associated with

Crevasses in alpine glaciers result from friction,tension,or compression.