Exam 18: Glaciers and Glaciation

The only continental ice sheets left on Earth today are in Greenland and Antarctica.

When did the ice-free corridor open in North America, allowing a path for human migration from Asia?

________ is unsorted, unstratified, bimodal sediment directly deposited by the glacial ice.

Arêtes, horns, and hanging valleys are evidence of ________ glaciation.

What bodies of water are formed when a stagnant block of glacial ice near the terminus becomes partly or completely buried in glacial sediments, eventually melting to create a lake?

The Mississippi River currently makes up the western boundary of the state of Illinois.However, the Ancient Mississippi River Valley once flowed through the center of the state, cutting off one-quarter of the state from its modern boundaries.How did the Mississippi River shift from its ancestral location to its present one? How did it end up staying in its current location? Explain.

The landform visible in this image is a drumlin.Based on the shape of the drumlin, which direction was the ice coming from? Assume that the top of the figure is north.

________ refers to the change in the angle Earth's axis makes with the plane of our planet's orbit.

Which of the following scenarios can lead to the formation of a kame?

What factors influence the rate of glacial erosion?

Read the following excerpt from The Works of John Playfair (1822).What glacial landform is being described? "…For the moving of large masses of rock, the most powerful engines without doubt that nature employs are the glaciers….[Rock] fragments they gradually transport to their utmost boundaries, where a formidable wall ascertains the magnitude, and attests the force, of the great engine by which it was erected."

How did erosion shape this glacial feature? (Hint: It is bedrock.)

The Zone of Fracture in a glacier is found in the uppermost 50 m of glacial ice.Explain why ice fractures above this depth, but not below.

The Laurentide Ice Sheet is an example of ________ glaciation.

Compare and contrast proglacial lakes and pluvial lakes.

Which of the following ice bodies is an example of alpine glaciation?

How does an ice cap compare to an ice sheet?

Glaciers in arctic regions that are frozen to their beds move via internal deformation.

Glaciers are a single, solid piece of ice that flows from the Zone of Accumulation to the Zone of Saturation.

What percentage of the Earth's land surface is currently covered by glacial ice?