What makes rare earth metals so valuable??
Fill in the blank(s) with the appropriate word(s).
Because of their superior magnetic strength and other unique properties, these elements and their compounds are important for a number of widely used technologies, including LCD screens, cell phones, and solar cells.
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The U.S. national park system includes ____ major national parks.
A. 12 B. 28 C. 58 D. 100 E. 110
Which is not associated with electromagnetic induction?
A. Thomas Edison. B. Joseph Henry. C. Nikola Tesla. D. George Westinghouse.
What region produces more oil than it consumes? (In other words, which region is a net exporter of oil?)
A) Asia B) Europe C) North America D) Russia and the former Soviet Republics E) none of the above
Judge the following sentence according to the criteria given below: The melting of Arctic sea ice by rising temperatures is an example of a negative-feedback loop BECAUSE the lack of ice cover will result in the Arctic Ocean reflecting more of the
Sun's radiation. 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.