Describe and discuss mass extinctions during the Paleozoic and Mesozoic. How do these mass
extinctions differ? What will be an ideal response?
There were mass extinctions of marine organisms at the end of the Ordovician and Devonian
periods. One of the most serious mass extinctions of marine organisms occurred at the end of the
Permian. During this mass extinction, 96 percent of all marine invertebrate species were
destroyed and 65 percent of land animal species. The mass extinction between the Mesozoic and
Cenozoic wiped out the dinosaurs and a smaller proportion of marine organisms.
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Each of the major continents at the beginning of the Paleozoic can be divided into two major
components:a. a trough and a range b. a craton and a mobile belt c. an immobile belt and a rift margin d. a craton and an ocean basin e. none of the above
The characteristics of floodplain sediment would include:
a. horizontal bedding, fine grain size, and abundant organic matter b. cross bedding, fine grain size, and abundant organic matter c. cross bedding, coarse grain size, and abundant organic matter d. horizontal bedding, coarse grain size, and very little organic matter
Which cloud would most likely produce drizzle?
a. stratus b. cumulus c. cumulus congestus d. cirrostratus e. cumulonimbus
Lunar eclipses last longer than solar eclipses
Indicate whether the statement is true or false