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Practice Listening: Multiple Choice, Single Answer ID: #40085 Short Caves
Instructions ›
You will see a video about the formation and features of caves. Listen to the recording and answer the multiple-choice question by selecting the correct response. Only one response is correct.

Transcript:

Caves are the most striking evidence of the geologic work of groundwater over hundreds of years, the dissolution of limestone or dolomite by groundwater results in underground cavities such as this cave in Central Texas. These spectacular cave formations, stalactites, stalagmites, and columns are formed by the deposition of the carbonate minerals dissolved from the surrounding limestone by groundwater, slowly drop by drop, these strange and beautiful cave deposits grow. Stalactites, icicle-shaped deposits hang from the ceilings of caves, while columns and stalagmites build up from the floor.

How are stalactites and stalagmites formed in caves?

* Listen to the recording and select the correct answer

Result:

AI explanationShows the answer. Tap to open.
Option 3: "By the deposition of carbonate minerals from groundwater."

Explanation: This option is correct because the text explicitly states that stalactites and stalagmites are formed by the deposition of carbonate minerals dissolved from limestone by groundwater. This aligns perfectly with the main idea of the text, which emphasizes the role of groundwater in cave formation.

Option 1: "By the rapid erosion of the cave walls by strong water currents."

Explanation: This option is incorrect because the text does not mention erosion or strong water currents as a method for forming stalactites and stalagmites. Instead, it focuses on the deposition of minerals from groundwater. Therefore, this option contradicts the information provided in the text.

Option 2: "By the accumulation and freezing of ice inside the cave."

Explanation: This option is incorrect as the text does not discuss ice accumulation or freezing as a process for forming stalactites and stalagmites. The formation is attributed to the deposition of carbonate minerals from groundwater, making this option irrelevant to the text.

Option 4: "Through volcanic activity forming natural sculptures."

Explanation: This option is incorrect as the text does not mention volcanic activity as a factor in the formation of stalactites and stalagmites. The text specifically attributes their formation to the deposition of minerals from groundwater, making this option inconsistent with the information provided.

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