Study the following set of excerpts, select the one that contains the most cause-effect discussion, as it is defined in Power Tools for Technical Communication, (you will have to scroll to see all of the items), and then press the Click here ... button:


Item 1 of 10

  1. Historical evidence of impacts, such as the one that extinguished the dinosaurs 65 million years ago and drove 70% of all species into extinction or the catastrophe at the end of the Permian (245 million years ago) where over 90% of all species were snuffed out in a moment of time, clearly demonstrate the incredible worldwide destructive power of asteroids striking the Earth.

  2. The end of the Permian era was about 245 million years ago. Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.

  3. If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (1 calendar year), the dinosaurs appeared January 1 and became extinct the third week of September. (Using this same time scale, the Earth would have formed approximately 18.5 years earlier.) By comparison, people (Homo sapiens) have been on earth only since December 31 (New Year's eve).