Exam 17: Glaciers and Glaciation

What kind of natural resource would you expect to find in channelized outwash sands sandwiched between tills?

Describe the correct relationship between the buildup and melting of continental ice sheets, and worldwide changes in sea level?

What glacial landform is responsible for a large portion of the water resources for greater metropolitan Toronto?

Melting and evaporation are two forms of ablative calving.

A ________ cross-valley profile is typical of canyons and valleys eroded and deepened by alpine or valley glaciers.

A fjord is ________.

________ are elongated asymmetrical hills of primarily till that were shaped by an overriding, continental ice sheet to gently taper and descend in the down-flow direction.

When did Earth's climate deteriorate enough to start this current cycle of glaciations in Antarctica?

How do most icebergs in the North Atlantic Ocean originate?

Rapid surge movements of Earth's tectonic plates offer a convincing explanation for the advances and retreats of the Pleistocene ice sheets.

Describe the transformations or steps in the process needed to make glacial ice.

All of the following are thought to possibly contribute to ice ages except for ________.

Which one of the following applies to a valley glacier that lengthens (extends its terminus downslope)over a span of many years?

Even when a glacier is retreating, the up-valley ice is still moving forward toward the down-valley terminus of the glacier.

The only true modern-day, continental ice sheets are on Antarctica and in the Canadian Arctic.

Which one of the following statements concerning glaciers is false?

The ________ of the geologic time scale occurs within the time of Earth's most recent "Ice Age."

Compare and contrast the bedding, typical grain size distribution, and sorting of a till versus glacial outwash sediments, and explain why this is so.

A(n)________ is a narrow, winding ridge composed of outwash deposited in a tunnel or channel in or under glacial ice.

________ developed and promoted the first comprehensive mathematical model that periodic variations in the geometry of Earth's orbit (eccentricity, obliquity, precession)were responsible for climatic oscillations of 1000 to 100,000 years.