TPO54-L4 New Evidence of River Hypothesis
Listen to part of a lecture in a geology class.
- What does the professor mainly discuss?
- A. A hypothesis that rivers formed before the rise of plant life
- B. A study of the effects that rivers have on soil formation
- C. A debate surrounding two opposing hypotheses
- D. New evidence in support of a previously proposed hypothesis
- What limitation of Cotter’s research does the professor mention?
- A. Cotter’s research findings could not be replicated.
- B. Cotter’s research was based on one geographical area.
- C. Cotter’s research did not take into account lateral accretion.
- D. Cotter’s research did not account for changes in climate.
- What did researchers try to confirm about rivers in a recent study?
- A. That rivers now have the same shape worldwide
- B. That rivers were responsible for the spread of plant life
- C. That a change in the shape of rivers is linked to the spread of plant life
- D. That most rivers emerged during a specific geological time period
- Why does the professor describe the composition of the sediment of the earliest rivers?
- A. To identify the evidence used to determine how the rivers flowed
- B. To explain why the rivers could easily dry out
- C. To suggest that the sediment was once fine sand
- D. To suggest that the geological record might be flawed
- According to the professor, what is an effect of lateral accretion on a meandering river?
- A. Bends in the river become gradually straighter.
- B. Material from one riverbank is deposited on the other.
- C. The intensity of the river’s flow increases.
- D. The growth of plants on the outer riverbank is enhanced.
- Why does the professor say this: 🎧
- A. To find out what the students know about Mars
- B. To question certain geological studies of other planets
- C. To express a reservation he has about the hypothesis
- D. To indicate that he is going to change the topic
D B C A B C