Which of the following types of volcanic eruption have occurred on Mount St. Helens since it began erupting in 1980?
A. pyroclastic flow
B. eruption column
C. volcanic dome
D. All of these choices are correct.
Answer: D
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How many molecules of sucrose are in a 0.5 moles of sucrose?
A. 3.01 × 1023 molecules of sucrose B. 6.02 × 1023 molecules of sucrose C. 12.04 × 1023 molecules of sucrose D. 0.5 E. 1 gram
With respect to the benefits of clean air and water, which of the following would most likely be classified as being relatively easy to value in economic terms?
A. gains in farming, fishing and tourism B. gains from lower levels of corrosion C. gains in environmental enjoyment D. all of the above are correct answers
International organizations and non-governmental organizations argue that the key to food security and reduced risk from famines and chronic hunger can be attained only through attention to
A) food sovereignty. B) free trade. C) increased production. D) GMOs and improved technologies. E) alternative food movements.
Which of these questions lies outside the realm of science?
A. What is the nature of the human spirit? B. What is the purpose of life? C. both of these D. none of the above