Which of the following elements are in the same group as silicon (Si)?
A. P
B. C
C. B
D. As
E. none of the above
Answer: B
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What country in the region is a cautionary tale about the limits of the ability of a valuable natural resource, such as oil, to promote development?
A) Angola B) Kenya C) Nigeria D) South Africa E) Sudan
Diatomaceous sediments are
A. found in cold water. B. oozes. C. found below 4500 m. D. All of these are correct. E. None of these is correct.
Which of the following is NOT a possible source of large stones along a shoreline?
A. Waves swirl away loose pieces of bedrock. B. Some rivers can deposit large cobbles near the shoreline. C. Large storms erode the deep seafloor and transport the rocks toward the beach. D. Undercutting by waves causes steep rock faces to collapse into the sea.
Why do most caves form in limestone rock formations?
A. Limestone is the most common kind of rock on Earth. B. Limestone is a soft rock. C. Limestone chemically reacts readily with acidified groundwater. D. Limestone dissolves in rainwater.