In frost wedging, the principal force is exerted against the ____ of the confining rock.
a - bottom
b - outside
c - walls
d - microscopic openings
e - top
c - walls
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The vast mountain ranges on the continents form mostly at ____________________ plate boundaries
Fill in the blank(s) with correct word
One of the major environmental hazards of heap leach mining is the use of cyanide for gold extraction
Indicate whether the statement is true or false
Which of the following about U.S. pollution levels is true?
A) The release of toxic chemicals has increased by 19%. B) The average levels of lead in the blood of children have declined by 90%. C) Acid deposition has increased by 27%. D) Total emissions of five principal air pollutants have increased by 14%.
Ocean basins with continental margins are representative of the ________ stage of the Wilson Cycle
A) declining B) juvenile C) mature D) suturing E) terminal