11.   When the impacts occurred, they said, some of the cavities formed followed the straight lines of the underground fractures instead of assuming a traditionally rounded shape.

12.   Bambach said that during both extinctions there were massive lava flows underway when the impacts occurred.

13.   The impact has occurred so quickly probably because people, in this era of globalization, are used to measuring their wealth against the U.S. dollar.

14.   As the impacts will occur on the dark side of the planet, however, only the Galileo probe will be in a position to observe them directly.

15.   Sydney Observatory has calculated that four impacts will occur while Jupiter is visible from Australia.