The angle of repose of sand-sized particles falling from the air is ________ degrees.
A. 44
B. 34
C. 14
D. 90
E. 24
Answer: B
Environmental & Atmospheric Sciences
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a. True b. False
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Indicate whether the statement is true or false
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What two chemical elements are most abundant in the deep interior of the earth?
A) magnesium and oxygen B) iron and magnesium C) hydrogen and helium D) silicon and oxygen
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