Reading Practice Test #U2013 6 (Reading Comprehension)

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The June 30 date of the Tunguska event was significant to some scientists because it
Correct Answer:
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Explanation:
suggested that the explosion may have been caused by a comet. (B) highlighted why tree resin from the time of the blast contained high-proton elements. (C) indicated that the blast may have resulted from Earth’s impact with a black hole. (D) explained why debris from outer space would have burned up in the atmosphere.

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