Major mass extinctions
What will be an ideal response?
> Cretaceous-Neogene Boundary: the extension of 50% of all species, including the dinosaurs, at the end of mesozoic era (66 million years ago)
> Triassic-Jurassic Boundary: the extension of 50% of all species, including the last of the mammal-like reptiles, leaving mainly dinosaurs on land (208 million years ago)
> Permian-Triassic Boundary: the greatest mass extension of all time, 96% of all species perish at the end of the paleozoic are (252 million years ago)
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Pyroclastic materials ____
A)have low viscosity and a ropy texture B)are rare to absent at great depths in the ocean C)do not vary in size D)are always ejected very quickly from volcanoes E)can only be found at locations where intraplate volcanism occurs
Water vapor is a greenhouse gas that is present at higher concentrations in the atmosphere than CO2. Why then is CO2 considered to be the primary greenhouse gas?
A. Water vapor has a much longer residence time in the atmosphere than CO2. B. Warming is amplified by additions of CO2that decrease the amount of water vapor that the atmosphere can hold. C. Warming is amplified by additions of CO2that increase the amount of water vapor that the atmosphere can hold. D. Lower levels of water vapor drive increases in CO2 concentrations. E. Water vapor concentrations are decreasing while CO2 concentrations are increasing.
A ____ is an organism, such as a mosquito, that transmits a disease-causing organism to a host.
a. virus b. fungus c. bacterium d. vector
Surface mining is ________ dangerous than underground mining, it is also ________ environmentally damaging
Fill in the blank(s) with correct word