________ is produced when grains of quartz in sandstone are welded together when the rock is subjected to high temperatures.
A. Monzonite
B. Quartzite
C. Marble
D. Limestone
E. Granite
Answer: B
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Carcinogens may be difficult to identify and study because ________
A) cancer may be caused by chronic, long-term exposure B) there is no way to measure the carcinogenic potential of a substance C) they are rare in nature D) they are the least common of the toxic substances
How is the earth's rotation axis oriented relative to the revolution orbit?
A) It varies somewhat randomly over small angles, less than 23.5 degrees. B) It is fixed and always points toward the North Star regardless of season. C) It changes with time so that it is perpendicular in June and December. D) We don't really know how much it varies because we have not been able to make observations from space for more than about 60 years.
Which of the following is a western boundary current?
A) Benguela Current B) Brazil Current C) Canary Current D) California Current E) Peru Current
Judge the following sentence according to the criteria given below: Vast populations of phytoplankton and zooplankton are referred to as schools BECAUSE they form well-defined social groupings that move in the same direction and are evenly spaced
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.