?Why can the reserves of a mineral change in size even if no deposits are discovered or depleted?
Fill in the blank(s) with the appropriate word(s).
Reserves are the identified deposits from which we can extract the mineral profitably at current prices. Reserves can be expanded when we find new, profitable deposits or when higher prices or improved mining technologies make it profitable to extract deposits that previously were too expensive to remove.
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Which group is most likely to support large-scale funding of hydrogen research?
A. electric utilities B. sustainable developers C. fossil-fuel companies D. automobile manufacturers E. heating and air-conditioning manufacturers
Evaporite deposits are examples of
A. metamorphic mineral deposits. B. sedimentary mineral deposits. C. igneous mineral deposits. D. None of the choices are correct.
Although ectotherms can tolerate large ranges in external temperature, they are unable to sustain large fluctuations in their internal temperatures
Indicate whether the statement is true or false
Which of the following volcanoes in the U.S. is most notably for having a history of massive mudflows, which today threatens large numbers of people?
A. Mauna Loa, Hawaii B. Mt. Rainier, Washington C. Mt. Spur, Alaska D. Mt. St. Helens, Washington E. Mt. Shasta, California