Which of the following has aided 20th century commercial farmers in MDCs?
A) transportation improvements
B) scientific advances
C) electronics
D) All of these have aided commercial farmers.
E) None of these have aided commercial farmers.
Answer: D
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Which of the following is not a type of evidence left behind by glaciers?
A) Scratched and polished bedrock B) Scattered stones (dropstones) in fine-grained sediment C) Changes in the isotopic compositions of marine shells D) V-shaped valleys E) All of these are evidence left behind by glaciers.
Minerals that have strong bonds between flat crystal surfaces tend to
A) cleave more easily. B) show poor cleavage. C) show well-developed cleavage. D) have a well-developed streak.
What is not usually able to be measured by flow meters?
A) Surface currents B) Intermediate waters C) Bottom waters D) Coastal waters
Judge the following sentence according to the criteria given below: The melting of Arctic sea ice by rising temperatures is an example of a positive-feedback loop BECAUSE particulate air pollution has a shading effect
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.