________, a Danish naturalist, was the first to note that the angle between two adjacent faces of a crystal of quartz is always exactly the same.

A. McGeary
B. Steno
C. Einstein
D. Carlson
E. Plummer


Answer: B

Environmental & Atmospheric Sciences

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A) less efficient than traditional flood or center-pivot systems. B) cheaper, compared to traditional flood or center-pivot systems. C) producing greater crop yields. D) used for most irrigation of crops in the United States.

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In which decade was the theory of plate tectonics developed?

A) 1940s B) 1960s C) 1970s D) 1990s

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What type of air mass would be responsible for hot, muggy summer weather in the eastern half of the United States?

a. mP b. mT c. cP d. cT e. cA

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Heat a copper wire and its electrical resistance

A. decreases. B. increases. C. remains unchanged. D. none of the above

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