TPO48-L2 Volcanic Anomaly


VolcanIC Anomaly

Listen to part of a lecture in an Earth Science class. The class has been discussing volcanoes.




  1. What is the lecture mainly about?
  • A. Ways to determine the ages of volcanic islands
  • B. Criteria for classifying various types of volcanoes
  • C. Explanations for why volcanoes occur in some locations
  • D. Methods for measuring magma produced by volcanoes


  1. According to the professor, why was the hot spot theory originally proposed?
  • A. To explain prolonged volcanic activity far from plate boundaries
  • B. To explain why volcanoes form both on land and in the ocean
  • C. To explain variations in the amounts of magma produced by volcanoes
  • D. To explain why volcanoes may become inactive after millions of years


  1. Why does the professor describe moving a sheet of heavy paper over a candle?
  • A. To clarify that plumes do not produce great amounts of heat
  • B. To describe an experiment he would like the students to conduct
  • C. To illustrate one hypothesis for the way some volcanic anomalies are formed
  • D. To emphasize the thinness of some of Earth’s tectonic plates


  1. Why does the professor discuss how high one of the Hawaiian Islands rises above the ocean floor?
  • A. To provide evidence supporting the plume hypothesis
  • B. To compare the Hawaiian Island to other volcanic islands in the Pacific Ocean
  • C. To point out a common difference between volcanic mountains and other types of mountains
  • D. To emphasize that hotspot volcanoes can produce large amounts of magma


  1. According to the crack hypothesis, what causes a hot spot?
  • A. Hot magma rises from deep in Earth to melt a piece of the crust.
  • B. Hot magma flows out through a break in the side of an active volcano.
  • C. Hot magma flows up through spaces created between tectonic plates as they move.
  • D. Hot magma flows up at a point where a tectonic plate has been stretched thin.


  1. What is the professor’s opinion of the two main hypotheses he presents?
  • A. Neither hypothesis can explain the formation of the Hawaiian Islands.
  • B. Each hypothesis accounts for some, but not all volcanic anomalies.
  • C. Each hypothesis explains the formation of more volcanoes than plate tectonics does.
  • D. The studies supporting the crack hypothesis are more convincing than those supporting the plume hypothesis.



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