Chapter 17 ReviewChapter 17 Review

Question 1Question 1

If new snow was added to a glacier faster If new snow was added to a glacier faster than ice & snow melts, what would than ice & snow melts, what would happen to the glacier?happen to the glacier?

It would get largerIt would get larger

Question 2Question 2

What type of glacier is an massive sheet What type of glacier is an massive sheet of ice that covers millions of square of ice that covers millions of square kilometers?kilometers?

ContinentalContinental

Question 3Question 3

Name at least 3 features that are formed Name at least 3 features that are formed by glacial deposition.by glacial deposition.

erratics, till, glacial drift, moraines, and erratics, till, glacial drift, moraines, and drumlinsdrumlins

Question 4Question 4

What is a cirque?What is a cirque?

A deep, bowl-shaped depression formed A deep, bowl-shaped depression formed by glacial erosion.by glacial erosion.

Question 5Question 5

What is the snowline?What is the snowline?

elevation above which ice & snow elevation above which ice & snow remains throughout the yearremains throughout the year

Question 6Question 6

What are the two ways a glacier can What are the two ways a glacier can move?move?

Basal slip & internal plastic flow.Basal slip & internal plastic flow.

Question 7Question 7

What is basal slip?What is basal slip?

The process that causes the ice at the The process that causes the ice at the base of a glacier to melt and the glacier base of a glacier to melt and the glacier to slide.to slide.

Question 8Question 8

What are large cracks in a glacier called?What are large cracks in a glacier called?

CrevasseCrevasse

Question 9Question 9

Outwash plains are usually filled with Outwash plains are usually filled with these depressions known as …these depressions known as …

kettleskettles

Question 10Question 10

A glacier works around small barriers by A glacier works around small barriers by melting and then …melting and then …

RefreezingRefreezing

Question 11Question 11

What is the grainy ice that form when What is the grainy ice that form when snow melts and refreezes called?snow melts and refreezes called?

FirnFirn

Question 12Question 12

The Great Lakes, an example of a glacial The Great Lakes, an example of a glacial lake, can form on the uneven surface of lake, can form on the uneven surface of what?what?

Ground MoraineGround Moraine

Question 13Question 13

Tear-shaped mounds of sediment formed Tear-shaped mounds of sediment formed by glacial deposition are what?by glacial deposition are what?

DrumlinsDrumlins

Question 14Question 14

What is the Milankovitch Theory?What is the Milankovitch Theory?

Cyclical changes in Earth’s orbit and in Cyclical changes in Earth’s orbit and in the tilt of its axis cause climatic changes.the tilt of its axis cause climatic changes.

Question 15Question 15

One piece of evidence of past ice ages One piece of evidence of past ice ages has been found by studying…has been found by studying…

Forminifera shellsForminifera shells

Question 16Question 16

What are the three factors that What are the three factors that Milankovitch mentioned that affects the Milankovitch mentioned that affects the solar energy reaching Earth’s surface?solar energy reaching Earth’s surface?

Eccentricity, Tilt, and PrecessionEccentricity, Tilt, and Precession

Question 17Question 17

What is a lateral moraine?What is a lateral moraine?

Deposition of unsorted material along the Deposition of unsorted material along the sides of a glaciersides of a glacier

Question 18Question 18

How is an iceberg formed?How is an iceberg formed?

The breaking of large block of ice from an The breaking of large block of ice from an ice shelfice shelf

Question 19Question 19

How do glacial and interglacial periods differ How do glacial and interglacial periods differ and relate these differences to the sea level?and relate these differences to the sea level?

Glacial periods are characterized by Glacial periods are characterized by advancement of glaciers and lowering of the advancement of glaciers and lowering of the sea level and interglacial periods are sea level and interglacial periods are characterized by retreatment of glaciers and characterized by retreatment of glaciers and raising of the sea levels.raising of the sea levels.

Question 20Question 20

What is a glacial erratic?What is a glacial erratic?

A boulder that has been transported and A boulder that has been transported and deposited by a glacier.deposited by a glacier.