地质学
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.
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