Articles on Limestone

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Sinkholes form when underground rock dissolves or sediment washes away and the surface collapses. Luis Diaz Devesa/Moment Collection/Getty Images

Why Philly has so many sinkholes

Sinkholes are fairly common in Philadelphia due to aging water lines that leak or burst, causing the surrounding soil to wash away.
Limestone pinnacles of the Nambung National Park karst. Matej Lipar

Limestone and iron reveal puzzling extreme rain in Western Australia 100,000 years ago

Otherworldly karst landscapes, such as Western Australia’s famous Pinnacles, hold clues about Earth’s climate history – and future.

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