Around 66 million years ago, a 15km-wide asteroid smashed into Mexico’s Yucatan Peninsula and is believed to have wiped out almost all the dinosaurs. The impact caused a megatsunami, liquified billions of tonnes of rock and created a 200km-wide crater in the Earth’s surface into which water seeped, creating thousands of sinkholes. Over millennia, some of these limestone sinkholes collapsed while others in the […]

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