Discuss how Silurian and Devonian reefs differed from Cambrian reefs. What will be an ideal response?
Cambrian reef structures were built around sessile archeocyathids, with sponges and
inarticulate brachiopods. These are all fairly simple organisms and their reefs were small and
patchy. In contrast, the Silurian and Devonian reefs were much more extensive and complex.
They were dominated by tabulate and rugose corals, assisted by stromatoporoids and algae,
and had a well-developed succession pattern.
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The lowest layer of the atmosphere is the ________
troposphere mesosphere stratosphere ionosphere
________ refer(s) to the scientific study of Earth.
A. Geology B. Hydrology C. Spheres
Which of the following was NOT one of the three dominant Native American civilizations of the southwestern United States?
a. Mogollon b. Hohokam c. Anasazi d. Cherokee
When carrying a heavy bag of beverages, you bang your hand against the wall. The concept that best explains why your hand hurts is
A. inertia. B. resistance. C. gravity. D. none of the above