ZT-Geology: Predict Volcanic Eruption

Predict Volcanic Eruption

1.What is the main purpose of the lecture?

  • A To explain why volcanic eruptions are predictable but earthquakes are not.
  • B To describe changes that help scientists predict volcanic eruptions.
  • C To compare the recent eruptions of Mount St. Helens and Mount Pinatubo.
  • D To discuss four types of instruments designed to predict volcanic activity.

2.What does the professor say about the recurrence interval?

  • A It is the most reliable predictor of a volcano’s next eruption.
  • B It tends to increase over the course of a volcano’s existence.
  • C It can be estimated by the depth of a volcano’s magma chamber.
  • D It can vary widely from volcano.

3.What point does the professor emphasize when he discusses Mount ST Helens?

  • A Magma begins entering the magma chamber hours before an eruption.
  • B Ice and snow typically melt on only one side of a volcano before it erupts.
  • C A bulge on a volcano can grow dramatically in a relatively short period of time.
  • D Bulges on volcanoes may develop steam vents.

4. What does the professor say about earthquake activity below volcanoes?

  • A The earthquakes can be more destructive than volcanic eruptions.
  • B The earthquakes occur more frequently before volcanic eruptions begin.
  • C The earthquakes may reduce the severity of the next eruption.
  • D The earthquake tend to be difficult to detect.

5. Why does the professor mention sulfur dioxide when he discusses the 1991 eruption of Mount Pinatub?

  • A To illustrate the large increase in gas emissions that can precede a volcanic eruption.
  • B To demonstrate an advantage of continuous monitoring of active volcanoes.
  • C To point out that hot springs near volcanoes typically release sulfur dioxide.
  • D To make a general point about the consequences of volcanic eruptions.

6.What does the professor imply when he says this:

  • A The woman was referring to information from a previous lecture.
  • B It is easy to miss the discussion about hot springs in textbook.
  • C Some students may have read the wrong textbook chapter.
  • D He almost forgot to mention an important point.