Brennan LeblancMarch 16 20208PQUIZ QUESTIONS1. What is the K-T boundary?A thin layer of gray clay that separates rock layers from the end of theCretaceous period to those from the beginning of the Tertiary period.2. If the rocks outside of Gubbio, Italy used to be at the bottom of an ocean, how are they now part of amountain? Show Get answer to your question and much more 3. Describe the differences scientists saw in the foraminifera found in rock layers above (after) and below Get answer to your question and much more 4. Which of the following events are possible sources of high levels of iridium in sediments? Write ‘yes’ or‘no’ next to each of the four possibilities. There may be more than one ‘yes’ response. Get answer to your question and much more 1. Which of the following statements about the K-T boundary are true? (Note: More than one answer is correct.)
Answers chosen: Attempts: 2. How do foraminifera found in rock layers above the K-T boundary compare to those in rock layers below?
Answers chosen: Attempts: 3. Iridium is a component of cosmic dust that rains down on Earth at a constant rate. Why did Dr. Luis Alvarez suggest measuring iridium levels across the K-T boundary?
Answers chosen: Attempts: 4. The scientific community was slow to accept the asteroid impact hypothesis. Why?
Answers chosen: Attempts: 5. Which evidence is consistent with the asteroid impact hypothesis? (Note: More than one answer is correct.)
Answers chosen: Attempts: 6. What was the critical piece of evidence that supported the hypothesis that an asteroid struck Earth about 65 million years ago?
Answers chosen: Attempts: 7. Which of the following effects of the asteroid impact would have caused large numbers of different species of animals and plants to die throughout the entire planet?
Answers chosen: Attempts: 8. Which characteristic was NOT advantageous for organisms in the million years after the catastrophic asteroid impact?
Answers chosen: Attempts: Recommended textbook solutionsEnvironmental Science for AP2nd EditionAndrew Friedland, Rick Relyea 965 solutions Applications and Investigations In Earth Science9th EditionDennis G. Tasa, Edward J. Tarbuck, Frederick K. Lutgens 1,295 solutions
Investigating Oceanography3rd EditionKeith A. Sverdrup, Raphael Kudela 547 solutions Environmental Science for AP3rd EditionAndrew Friedland, Rick Relyea 957 solutions Why was the scientific community so slow to accept the asteroid impact hypothesis?7. (Key Concept J) Explain why the scientific community was slow to accept the asteroid impact hypothesis. The asteroid hypothesis as the cause of the K-T mass extinction was not immediately accepted because at the time, geologists believed that the Earth changed slowly and gradually, without major catastrophes.
What is the evidence for the asteroid impact theory?The asteroid impact theory is supported by quite a bit of evidence. For example, the fossil record shows that dinosaurs went extinct very suddenly. This is more consistent with a major disaster like an asteroid impact than it is with a gradual change in climate or volcanic activity.
What is the asteroid impact hypothesis?The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.
Which piece of evidence led scientists to dismiss the supernova hypothesis?12B) Which piece of evidence (a-g) lead scientists to dismiss the supernova hypothesis? F, Finding that an isotope of plutonium is not in the K-T boundary layer.
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