What evidence supports the hypothesis that a meteorite impact might have caused the extinction
at the end of the Mesozoic? What will be an ideal response?
An iridium anomaly at the Cretaceous-Paleogene boundary supports the extraterrestrial impact,
because iridium is rare in crustal rocks but found in higher concentrations in meteorites. There is
an impact crater in Chicxulub, Yucatan peninsula that includes shocked quartz, wave deposits,
and tectites.
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Which of the following terms refers to the bending of light that occurs when it enters and passes through a substance of different density?
A. scattering B. diffraction C. reflection D. refraction
The eruption that occurred on Mount St. Helens was triggered by a
A) huge landslide caused a lateral blast that knocked down trees and buildings. B) fast-moving viscous lava flow flowed through the middle of Portland. C) volcano that was so heavy that it caused part of the island to collapse. D) cinder cone that sent up a large column of pyroclastic material. E) None of these are correct.
Homo habilis coexisted with _____ for approximately 200,000 years
A)Homo sapiens B)Australopithecus sediba C)Australopithecus robustus D)Australopithecus afarensis E)Australopithecus anamensis
Current ethanol production in Brazil is different from ethanol production in the United States because in Brazil,
A) special enzymes that break down cellulose into sugars are used. B) ethanol is used to heat homes and generate electricity. C) sugar cane is used instead of corn. D) natural gas is used to generate ethanol.