What are rare-earth elements, and where are they found in the ocean?
a) An assortment of 17 elements like neodymium used in technology, found in sea floor muds
b) Gypsum and halite used for making casts, molds and sheetrock (gypsum), and as table salt (halite), found in warm shallow water
c) Gas hydrates used for fuels, found on continental shelves
d) Manganese nodules used in modern technology, found near hydrothermal vents
A
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In which of the following periods did the Viking colony in Greenland perish?
A. climatic optimum B. Pleistocene epoch C. Mt. Pinatubo explosion D. Little Ice Age
The boundary between Argentina and Chile is an example of a
A) prorupted boundary.
B) geometric boundary.
C) physical boundary.
D) cultural frontier.
E) perforated frontier.
Which of the following is synonymous with "fact"?
A) a hypothesis B) an observation which is reproducible C) an observation which is not reproducible D) none of these
In which part of the area in the Investigation would you most likely find uncontaminated groundwater?
A. south B. west C. east D. north