The polar front occurs in which of the following regions?

A) 30 degrees
B) 30 to 60 degrees
C) 60 degrees
D) 60 to 90 degrees
E) Poles (90 degrees)


C

Environmental & Atmospheric Sciences

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a. True b. False

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a. ?at the ground. b. ?about 5 feet above the ground. c. ?at the top of a high-rise apartment complex. d. ?at the level where thermals stop rising. e. ?on top of a mountain.

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Each of the major continents at the beginning of the Paleozoic can be divided into two major components, a(n) ____

a. trough and a range b. craton and a mobile belt c. immobile belt and a rift margin d. craton and an ocean basin e. immobile belt and a mobile belt

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The two most abundant elements in Earth's crust are ___.

a) iron and magnesium b) carbon and hydrogen c) carbon and oxygen d) hydrogen and oxygen e) oxygen and silicon

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