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The Conversation USA

Why Philly has so many sinkholes

  • Written by Laura Toran, Professor of Environmental Geology, Temple University
imageSinkholes form when underground rock dissolves or sediment washes away and the surface collapses.Luis Diaz Devesa/Moment Collection/Getty Images

In early January, a giant sinkhole formed at an intersection in the West Oak Lane neighborhood of North Philadelphia after a water main break. Just two weeks earlier, the city reopened a section of the...

Read more: Why Philly has so many sinkholes

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