地质学 TPO16-L1 Lechuguilla Cave

地质学

TPO16-L1 Lechuguilla Cave

Listen to part of a lecture in a geology class.

 



  1. What is the main purpose of the lecture?
  • A. To explain the various ways that sulfuric acid is involved in the formation of caves.
  • B. To describe caves and other geologic formations in U.S. national parks.
  • C. To use Lechuguilla Cave as an example of how most caves form.
  • D. To discuss the formation and characteristics of an unusual type of cave.

 

  1. The professor mentions parts of the process involved in the formation of Lechuguilla Cave. Indicate which of the statements below describe part of the process.
  Yes No
Gypsum residue accumulated to form decorative structures A B
Gas generated by bacteria reacted with gypsum deposits A B
Hydrogen sulfide gas mixed with underground water A B
Acid dissolved parts of the limestone A B
Bacteria fed on underground oil A B
Flowing surface water enlarged the cracks in the limestone A B
  1. According to the professor, what substance found in surface water is important for the formation of typical limestone caves?
  • A. Gypsum.
  • B. Oxygen.
  • C. Carbonic acid.
  • D. Sulfuric acid.

 

  1. What does the presence of gypsum in Lechuguilla Cave indicate?
  • A. The cave was not formed by flowing water.
  • B. The cave is no longer forming.
  • C. Bacteria are present in high concentrations inside the cave.
  • D. No type of acid was involved in the formation of the cave.

 

  1. What can be inferred from be fact that Lechuguilla Cave is no longer forming?
  • A. The cave has stopped attracting visitors.
  • B. The cave no longer contains any limestone.
  • C. The air in the cave is safer to breathe now than it was in the past.
  • D. Gypsum deposits inside the cave are growing thicker.

 

  1. What does the professor mean when he says this: 🎧
  • A. Lechuguilla Cave is not completely absent of water.
  • B. Lechuguilla Cave is not totally safe to explore.
  • C. Water long ago flowed through Lechuguilla Cave.
  • D. Scientists do not agree about how Lechuguilla Cave was formed.



答案:
D ABAAAB C A C A


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