英语听力：探索发现 2014-06-29 BBC 地平线：陨石的真相-21

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Now if a piece of rock that big had hit that area of Russia, it would have produced a huge impact crater¹. Then that kinetic² energy is then delivered into the ground and we see things like seismic³ shock. So, you get … people would feel earthquakes on the ground.

 

So the fact that it was an airburst actually limited the consequences for the people on the ground. So, yes, still quite dramatic, still, you know, obviously, causing injuries. But it could have been a lot worse, had it survived down to ground.

 

Ground strikes are amongst the most destructive natural hazards we know of. When viewed from space, Earth’s encounters with giant asteroids⁴ in its deep history are revealed. And there is evidence from our planet’s past of a truly devastating⁵ meteorite⁶ strike that decisively altered the course of life on Earth.   

 

Today millions of years after the impact, the evidence for that crater is well hidden. This is a gateway⁷ to the cenotes, the unique cave system of Mexico’s Yucatan Peninsula.

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