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Why Philly has so many sinkholes

  • Written by Laura Toran, Professor of Environmental Geology, Temple University
Why Philly has so many sinkholesSinkholes 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...

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