Exam 18: Glaciers and Glaciation

Sea level rises during a glaciation because glaciers are pushing down on the crust, which deforms the ocean basins.

North American glaciations used to be described in four episodes.However, two of those episode names, the Kansan and Nebraskan, are no longer used.What evidence did scientists use to redefine the glacial history on the North American continent?

In order for a bimodal sediment to be called till, it must be directly deposited by glacial ice.If it is not, it is referred to as a diamicton.

A(n)________ is a sharp mountain peak created by erosion from several cirque glaciers.

________ are former river valleys that were oriented parallel to the direction of ice flow and were scoured deeper by advancing glacial ice.

The North American continent was covered by more ice than the South American continent at the height of the Ice Age.

Which part of a glacier is responsible for abrasion and plucking?

How is isostatic rebound affecting the Lake Michigan Basin?

What is a pluvial lake?

Which state would you not expect to contain drumlins, eskers, and kettle lakes?

The Earth is still in an Ice Age today because there are still glaciers on the planet.

Most glaciers worldwide are currently in a state of retreat.

Which crevasse will form perpendicular to the terminus as a glacier stretches to fill a valley?

What substance is responsible for the turquoise color of the water in this image?

What kind of lake was Lake Agassiz in this image?

________ is fine silt generated by glaciers that can be carried for long distances by the wind.

What erosional feature is visible in this image? (Hint: It is bedrock.)

What landform is present in this image?

Why would construction businesses find eskers to be economically important?

The Hubbard Glacier in North America is an example of which kind of glacier?