Dinosaurs the Topic Must Be Thesis

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Deposition occurred over a very long time period. The study found that the sediments separating the two events were characteristic of normal sedimentation, with burrows formed by creatures colonizing the ocean floor, erosion and transportation of sediments, and no evidence of structural disturbance" which means that there is no reason to believe that the asteroid impacted normal life in measurable fashion very quickly, or that fossil evidence of the asteroid's impact had been disrupted (New blow against dinosaur-killing asteroid theory, geologists find, 2009, National Science Foundation).

Even defenders of the asteroid theory think it is unlikely that it was a one-time event that killed most of the life on planet earth, and believe that the asteroids created inhospitable conditions that developed over time. Recent research also indicates that the asteroid "landed in deeper water than previously assumed and therefore released about 6.5 times more water vapor into the atmosphere.

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The impact site also contained sulfur-rich sediments called evaporites, which would have reacted with water vapor to produce sulfate aerosols. This means that an increase in the atmospheric concentration of the compounds could have made the impact deadlier in two ways: not just by altering climate as assumed previously, but also by generating acid rain which h would explain why reef and surface dwelling ocean creatures were affected along with large vertebrates on land and in the sea. As it fell on the water, acid rain could have turned the oceans more acidic" (Seismic images show dinosaur-killing meteor made bigger splash, 2008, UTA). However, this is still only conjecture, and many other competing theses remain popular in the scientific community, regarding the dinosaur's destruction, including volcanic activity, species competition, and continental drift (Hypothesis: Asteroid impact, 2009, PBS).

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