Chapter 15 Test: Glaciers and Erosion
________ pyramid-like peak made of arêtes
A. snowfield 2.
________the unsorted material left beneath
B. snowline the glacier when the ice melts
________depressions where most outwash plains are pitted
C. cirque 4.
________theory that most scientists now accept
D. kettles 5.
________masses of ice that occupy millions of square kilometers
F. Milanokovitch Theory 7.
________an almost motionless mass of permanent snow and ice
G.ground moraine 8.
________elevation above which ice and snow remain throughout
H. crevasses the year
I. continental ice sheets
True and False:
The Great Lakes of North America are the result of a combination of erosion and deposition by continental ice sheets. ¬¬¬¬¬_______ 12.
When continental ice sheets recede, long ridges of gravel and course sand are absorbed on the way. ________ 13.
Snow accumulates year after year in polar regions and in the United States. _______ 14.
A snowline is an almost motionless mass of permanent snow and ice. ________ 15.
Glacial erosion may produce a bowl-shaped depression know as an esker. ________ 16.
A kettle is a mound. ______
A long period of climatic cooling during which continental sheets cover large areas of the earth’s surface is known as an ice age. ________ 18.
The composition of the water in a salt lake depends on the solved materials it contains. ________ 19.
Glaciers covered nearly two-thirds of the earth’s land surface during the last glacial period. _______ 20.
Ice ages probably begin with a long-term increase in the earth’s average temperatures. _______
Fill-in The Blank:
The two main types of glaciers are valley glaciers and ________ ice sheets. 22.
During an ____ age, glacial advances alternate with glacial retreats. 23.
The ____________ Theory is the most commonly accepted...
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