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 welldeveloped
succession pattern.
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According to Graph ?, between which two temperatures does the number
of tropical cyclones in the Northern (Jun – Sep) and Southern (Dec – Mar) Hemispheres begin to increase signifi cantly? What will be an ideal response?
____________________ occurs when light bends around small objects
Fill in the blank(s) with correct word
These vertical shafts of light are created by slowly falling crystals of ice
What will be an ideal response?
If greenhouse emissions continue to accumulate in the atmosphere at the current rate over the next century, it is predicted that global temperatures will rise by ________
A) 10°C B) 5°C C) 3°C D) 1°C E) 8°C