Exam 17: Glacial and Periglacial Landscapes

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

Which correctly lists sorting of sediments deposited by glacial ice and glacial meltwater?

Patterned ground results from repeated freeze/thaw cycles and self-organization whereby stones are attracted towards stone domains and soil towards soil domains.

Unlike V-shaped stream-cut valleys,glacial cut valleys are U-shaped.

Describe the importance of periglacial processes.

Over 25% of the measured sea level rise has been attributed to alpine glacier wastage.

Why is glacial ice analogous to a metamorphic rock?

Overall,the Arctic is much cooler than Antarctic.

The Pleistocene ice age began 18 000 years ago.

The thickness of the active layer increases toward the poles.

Which of the following best describes valley glaciers?

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

Eroded debris dropped at the glacier's farthest extent is called which moraine?

During a glacier surge,a glacier may move at which speed?

List several distinct landforms created by alpine glaciers and ice sheets,describing the manner in which they formed.

A valley glacier is a form of alpine glacier.

Which of the following has been cited as a possible cause of ice sheet darkening?

In which year did surface melt on the Greenland ice sheet reach its greatest extent?

Which is an asymmetrical hill of exposed bedrock produced by plucking and abrasion?

Antarctica is colder than the Arctic because