Table for Individual Question FeedbackPoints Earned: 1.0/1.0 Correct Answer(s):D14. Extinctions have occurred throughout Earth’s history. What is accurate about the history of extinctions? A) Prehistoric humans almost completely stopped extinctions, but modern humans are greatly accelerating the rate of extinction. B) Prehistoric humans slowed extinctions far below the natural rate, and modern humans have slowed the rate of extinction even more. C) Prehistoric humans cause extinctions faster than is typical naturally, and modern humans are also causing extinctions. D) Because of prehistoric and modern human activities, we are sure that by the time you are old and gray, the only things alive on Earth will be humans and robo-cockroaches. E) Prehistoric humans greatly accelerated extinction rates, but modern humans have almost completelystopped extinctions for now and in the future.Feedback: Extinction has happened naturally, but humans have greatly accelerated the rate. Early humans caused extinctions, and so have modern humans, with real worries that the rate of extinction will accelerate a lot more in the near future. Table for Individual Question FeedbackPoints Earned: 1.0/1.0 Correct Answer(s):C
15. The Marcellus shale is: A) A major new source of Pepsi products, just waiting to be pumped out. B) A major new source of coal that was deposited in the bottom of an ocean without oxygen a long time ago. C) A major new source of gas that has become available because people developed the technological tools to recover the gas. D) A major new source of gas that was sitting there right under everyone’s noses and all you had to do was drill in and suck out the gas. E) A major new source of oil that had leaked into the rocks from sandstone layers above and below.Feedback: Water containing special chemicals is pressurized in holes bored through the Marcellus Shale, breaking the rocks to make pathways that allow the gas in the rock to escape through the holes to the surface, where it can be sold. Table for Individual Question FeedbackPoints Earned: 0.0/1.0 Correct Answer(s):C
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- Fall '08
- Correct Answer, Pennsylvania, Individual Question