What is cenote? 06/13/2010
 
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65 million years ago, a meteorite more than 10 km wide collided with the Earth. 
It was travelling at 20 km per second and at the time of impact, its temperature was three times that of the sun's surface. The massive meteor created a colossal crater - more than 2,5 kilometers deep and about 200 km in diameter - the largest and the best preserved crater on Earth. I caused volcanos to erupt, the planet to tremble, and tidal waves more than 500 m high. 
This monumental movement, in turn, sent millions of tons of pulverized rock into Earth's atmosphere, plunging it into darkness. The lack of sun eventually led to the demise of more than 70 percent of all living things on the planet, including the dinosaurs. 
All this is very interesting, but why mention it here? 
Because this meteor hit exactly at the Yucatan Peninsula, and is the reason why the area had eroded so dramatically, creating a ring of caves and cenotes in numbers found nowhere else on Earth!