A Roof Made of What Kind of Material Collapses to Form

question 8

Multiple Choice

A roof made of what kind of material collapses to form a cover subsidence sinkhole?

• A) sandy and permeable sediment
• B) evaporate deposits of salt and gypsum
• C) solid limestone with a few fractures
• D) porous limestone with lots of fractures
• E) swelling soil

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