地质学
TPO31-L2 Plate Drift
Listen to part of a lecture in a geology class.
- What is the lecture mainly about?
- A. How to predict the rate of tectonic plate movement.
- B. A geologist’s attempt to determine the position of continents in the past.
- C. Some ideas about future movements of Earth’s tectonic plates.
- D. The history of a debate between two plates tectonic theories.
- The professor states that some continents are currently moving northward and some are moving westward.Indicate the direction in which the continents are currently moving.
| Northward | Westward | |
| Africa | A | B |
| Americas | A | B |
| Australia | A | B |
- What process is currently taking place in the Atlantic Ocean?
- A. One half of the ocean plate is sinking beneath the other half.
- B. New rock is forming between two sections of the ocean floor.
- C. A subduction zone is forming at the eastern edge of the ocean floor.
- D. The ocean plate is moving away from the continental plates that are under the Americas.
- What long-term geoprediction do many geologists make?
- A. Continents will become smaller than they are now.
- B. Subduction will cause one continent to sink under an ocean.
- C. North and South America will move away from each other.
- D. The current continents will eventually join together.
- Based on the discussion, what happens when a continental plate and an oceanic plate collide?
- A. The edge of the oceanic plate moves down into the mantle.
- B. Slab pull causes the ocean floor to expand.
- C. New rock material rises to the surface at the subduction zone.
- D. Parts of each plate break off into the ocean.
- What is important difference between the two hypotheses discussed by the professor?
- A. They make different predictions about the direction in which the American continents will move.
- B. They make different predictions about how long it will take for Pangaea Ultima to form.
- C. Only one predicts that Asia will eventually begin to move eastward.
- D. Only one predicts that some tectonic plates will eventually stop moving.
答案：
C ABA B D A A
