Exam 17: Glacier Landforms and the Ice Age

There has been only one significant glacial episode in the last 200,000 years.

Which of the following types of till shows no sorting and often consists of a mixture of sand and silt?

Hanging valleys are formed by ice sheets when they erode high mountain peaks.

The term ________ means the loss of snow and ice by evaporation and melting.

A smooth hill,modest in size,elliptical in shape and which rises from a till plain is called a/an:

Lobes of ice flowing from the Laurentide ice sheet spread around an area in Wisconsin known as the Driftless Area.

Glacial melt-water deposits of sand and gravel are collectively referred to as:

Which of the following types of till includes all varieties of rock debris deposited in close association with glaciers?

When the floor of a trough open to the sea lies below sea level,the sea water enters as the ice front recedes,forming a fiord.

Of the following locations,which is not covered with an ice sheet?

What is the name given to lakes that form in hollows left behind by prior alpine glaciers?

Which of the following types of till is an unstratified mixture of rock fragments ranging in size from clay to boulders?

The last glaciation reached its furthest extent over North America around _________ years ago.

Streams of meltwater from the terminus of a glacier build glacial deltas that eventually become flat-topped land forms known as kames.

At high elevations,orographic precipitation encourages the growth of glacial ice.

A steep-sided depression formed in glacial till that is the result of the melting of a buried block of ice is referred to as a/an:

Using an annotated diagram,describe the depositional land forms produced by continental glaciers.Where relevant identify examples of such features in your local region,or provide well-known examples from around the world.

A rock knob is shaped by moving ice,such that the lee side is eroded by glacial abrasion to create a smooth surface.

The valley of a tributary glacier results in a discordant junction is referred to as:

Most scientists studying climate change during the Ice Age agree that the primary factor explaining the cycles of the glaciations is ___________________.