Which is a type of high-grade deposit containing highly concentrated ore minerals?
A. A disseminated deposit
B. A country rock
C. A pegmatite
D. A vein deposit
Answer: D
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How do environmental scientists deal with chemicals that sink to the bottom of an aquifer?
A) They leave them alone because the chemicals have not mixed with the drinking water supply. B) They add a coagulating chemical to make sure the chemicals solidify and remain deep in the Earth. C) They create a cone of depression some distance away to suck the contaminant in an opposite direction. D) They pump them up through a well drilled to the bottom of the aquifer.
Energy from the sun is constantly ____.
A. increasing in quality B. being recycled C. being destroyed D. becoming matter E. supporting plant growth
The most frequent time of day for hail based on a sample of five U.S. cities is
A. 6 a.m. B. 10 p.m. C. 4 p.m. D. noon.
The most common class of dunes is
A) parabolic B) star C) dome D) linear E) crescentic