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Give two lines of evidence supporting the asteroid impact hypothesis for the Cretaceous extinctions.
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- Describe the evidence for the cause of the Cretaceous–Paleogene (K–Pg) mass extinction.Scientists are examining the possible role of a large asteroid in the cretaceous mass extinction event. A large asteroid strike would likely have caused rapid climate cooling and the diffusion of sunlight. which of the following statements are the best null and alternative hypotheses when scientists look at the geologic evidence of extinction related to the asteroid strike?1) What piece of evidence initially convinced Dr. Alvarez that a mass extinction had occurred at the K-T boundary? 2) What was the first clue that an asteroid had struck Earth at around the same time as the mass extinction? 3) What additional observations and findings supported the asteroid-impact hypothesis? Which piece of evidence definitely showed that an asteroid had struck Earth? Explain your answer.
- 29) The Cretaceous extinction. which was the most recent mass extinction, occurred about 65.5 million years ago. What is the leading hypothesis to explain the Cretaceous extenction? A) The Indian sub-continent collided with the Asian techtonic plate, giving rise to the Hymalayan mountains which altered the jet stream and caused the planet to enter an ice age B) An asteroid about 6 km in diameter collided with Earth, which vaporized the caribbean ocean, set fire to north and south America, and expelled enough dust into the atmosphere to block the sun enough to result in a winter like environment all across the globe for several years C) A new group of predators evolved that were significantly better at capturing prey, to the point that they drove many species (including other predators and eventually themselves) to extinction D) Massive amounts of volcanic activity released tons of CO2, enough to significantly increase the temperature of the planet 30) The Permian extinction, which…List several significant events in the history of life on earth that are associated with the K-T Boundary.Explain at least one reasonable hypothesis about what caused the extinction of the dinosaurs at theK–T extinction (abbreviation of Cretaceous–Tertiary extinction) also called the K–Pg extinction or Cretaceous–Paleogene extinction event about 66 million years ago.
- Scientists are examining the possible role of a large asteroid in the Cretaceous mass extinction event. A large asteroid strike would likely have caused rapid climate cooling and diffusion of sunlight. Which of the following statements are the best null and alternative hypotheses when scientists look at the geologic evidence of extinction related to the asteroid strike? Null: The rate of extinction would be steady over the entire length of time the climate was altered. Alternative: The rate of extinction would be greatest immediately before the asteroid strike. Null: The rate of extinction would gradually decrease over the entire length of time the climate was altered. Alternative: The rate of extinction would be at its lowest immediately after the asteroid strike. Null: The rate of extinction would be steady over the entire length of time the climate was altered. Alternative: The rate of extinction would be greatest immediately after the asteroid strike. Null: The rate of…Which of the following do not provide evidence that a meteor strike was a partial cause of the Cretaceous-Paleogene mass extinction? a. A potential meteor crater off the coast of Mexico b. High layers of iridium in soil deposits in the geologic record at that time c. Shocked quartz was formed in large quantities at that time around the potential impact site d. An ozone hole appeared in the atmosphere at the time of the meteor strikeWhat are some of the hypothesized causes of Earth’s biggest mass extinctions?
- Explain why it is difficult to use carbon-14 dating on 100-million-year-old dinosaur fossilsThe Beringia hypothesis has been accepted for many years, but newer DNA evidence from sagebrush, trees, woolly mammoths, bison, rabbits, and other species found in sediments of ancient lakes that once separated the retreating glaciers suggest that the most recent land bridge was actually 12,600 years ago and not 25,000 to 15,000 years ago. How would these new findings alter the explanation for evidence of humans in North America dating to before 12,600 years ago?According to Figure 2 above, how many extinction events contributed to the end-Ordovician mass extinction and when did they occur?