| 1. | The " debris cloud " is self-propagating.
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| 2. | Two large debris clouds were created.
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| 3. | As the second of the towers toppled, a firefighter frantically backpeddled away from the debris cloud.
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| 4. | The debris cloud was so thick that he had to use the handrails to guide himself over the familiar route.
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| 5. | Once these debris clouds cross Earth's orbit and penetrate Earth's atmosphere, minute particles begin their flaming descent.
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| 6. | The Colorado team focused on the other end of the problem : the debris cloud and how it coalesced into the Moon.
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| 7. | Notice the lack of debris in this photo, debris clouds are used to verify that a tornado has in fact touched down.
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| 8. | Many of the remaining chiefs had been scattered by the debris clouds, and now fires raged in buildings that surrounded the collapse site.
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| 9. | First Carter's Eagle, then the Moon, are engulfed in a mammoth debris cloud billowing outwards from the now-volatised asteroid.
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| 10. | In a third interview, Chief John Peruggia described being saved by a firefighter as he tried to outrace the debris cloud after the second collapse.
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