In the strictly geologic use of the word, a sinkhole happens when water erodes solid bedrock, carving an underground cavity that can then collapse. Many parts of the United States are at risk for that sinkhole dangerous.
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The Guatemala sinkhole fits into a broader use of the term, which refers to any sudden slump of the ground’s surface. Instead of solid bedrock, much of Guatemala City rests a top a layer of loose, gravelly volcanic pumice that is hundreds of feet thick. And at least one geologist says leaking pipes,not nature,created the recent sinkhole.
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Overall, the risk for repeat sinkholes in Guatemala City is high but highly unpredictable.
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