gly 1102 topic 37

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The Barringer Meteor Crater is a young (50,000 years old) crater located inside this state.
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Arizona
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The greatest extinction (in percent of species extinct) in history occurred at the end of this period.
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Permian
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(blank) are \”dusty iceballs\” of rock, frozen water and organic compounds.
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Comets
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Once the flash heating of the atmosphere by the terminal Cretaceous impact cooled, atmospheric temperatures would have risen because of the vast amount of particulate matter in the atmosphere blocking solar radiation from reaching the surface.
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false
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The vast majority of asteroids in our solar system are found in the Asteroid Belt between Jupiter and Pluto.
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false
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The shortcoming of the volcano hypothesis is that it fails to demonstrate that the volume and type of volcanism could have accounted for the impact evidence and there can be little argument that a giant asteroid collided with Earth at precisely the time of the global extinctions.
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true
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A rough estimate of the average duration of species prior to extinction is
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about 2 million years.
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The comet head consists of a solid nucleus surrounded by a (blank) up to 1.5 million miles in diameter.
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nebulous coma
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(Blank) is a rare platinum group metal.
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Iridium
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The Kuiper Cloud is a large, spherical cloud of comets surrounding the solar system.
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false
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The extinction of a species occurs when the last representative of a species is no longer capable of reproducing and dies, leaving only the fossil legacy of its time on earth.
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true
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Microtektites are small, droplet-shaped silica glass cooled from molten material expelled from an impact crater.
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true
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The fossil record reveals that the rate of extinction over geologic history was not a uniform rate.
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true
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The Deccan traps of India and Pakistan, southern Brazil, and the western U. S. all show evidence of extensive volcanism at the time of the C/T boundary.
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true
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The most famous of all extinctions occurred at the end of the (blank) and marks the boundary between the Mesozoic and Cenozoic Eras.
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Cretaceous
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In 1981, the geophysicist G. Penfield found a bowl-shaped depression near the Yucatan Peninsula town of Chicxulub that he thought might be the C/T boundary impact crater.
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true
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Unlike the moon, Earth has very active weathering processes that over time remove the evidence of impacts, or at least make old one s very hard to recognize.
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true
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All dinosaurs became extinct at the Creatceous/Tertiary boundary.
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true

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