An 18-foot-deep sinkhole opened up in Ontario, covering an entire intersection and forcing a major street to shut down.

Fossil collectors in Florida have discovered an ancient sinkhole, now at the bottom of a river, which holds the remains of animals rarely seen in the state, including a type of giant armadillo, giant ...

Red tide is caused by a harmful algae bloom. It can bring respiratory problems and even fish kills in high concentrations.

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