ISEE Reading Question 243: Answer and Explanation

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Question: 243

6. Which of the following statements is NOT true of tephra?

  • A. It can range in size from tiny particles of ash to huge boulders.
  • B. It can travel thousands of kilometers from a volcano.
  • C. It can be found trapped in magma.
  • D. It is the term for rock fragments erupted into the air by volcanoes.

Correct Answer: C

Explanation:

C is correct. During a volcanic eruption, magma blasts into the air and breaks apart into pieces called tephra; thus choice D is true. As explained in the last paragraph, tephra can vary greatly in size (choice A), and it can travel hundreds to thousands of kilometers downwind from a volcano (choice B). Gases, not tephra, may be trapped in magma; therefore, choice C is the only choice that is NOT true of tephra.

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