Chapter 17 Review.

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Presentation transcript:

Chapter 17 Review

Question 1 If new snow was added to a glacier faster than ice & snow melts, what would happen to the glacier? It would get larger

Question 2 What type of glacier is an massive sheet of ice that covers millions of square kilometers? Continental

Question 3 Name at least 3 features that are formed by glacial deposition. erratics, till, glacial drift, moraines, and drumlins

Question 4 What is a cirque? A deep, bowl-shaped depression formed by glacial erosion.

Question 5 What is the snowline? elevation above which ice & snow remains throughout the year

Question 6 What are the two ways a glacier can move? Basal slip & internal plastic flow.

Question 7 What is basal slip? The process that causes the ice at the base of a glacier to melt and the glacier to slide.

Question 8 What are large cracks in a glacier called? Crevasse

Question 9 Outwash plains are usually filled with these depressions known as … kettles

Question 10 A glacier works around small barriers by melting and then … Refreezing

Question 11 What is the grainy ice that form when snow melts and refreezes called? Firn

Question 12 The Great Lakes, an example of a glacial lake, can form on the uneven surface of what? Ground Moraine

Question 13 Tear-shaped mounds of sediment formed by glacial deposition are what? Drumlins

Question 14 What is the Milankovitch Theory? Cyclical changes in Earth’s orbit and in the tilt of its axis cause climatic changes.

Question 15 One piece of evidence of past ice ages has been found by studying… Forminifera shells

Question 16 What are the three factors that Milankovitch mentioned that affects the solar energy reaching Earth’s surface? Eccentricity, Tilt, and Precession

Question 17 What is a lateral moraine? Deposition of unsorted material along the sides of a glacier

Question 18 How is an iceberg formed? The breaking of large block of ice from an ice shelf

Question 19 How do glacial and interglacial periods differ and relate these differences to the sea level? Glacial periods are characterized by advancement of glaciers and lowering of the sea level and interglacial periods are characterized by retreatment of glaciers and raising of the sea levels.

Question 20 What is a glacial erratic? A boulder that has been transported and deposited by a glacier.