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
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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
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
Most hazardous volcanoes occur near subduction zones
a. True b. False
The greatest variation in daily temperature usually occurs
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.