Summarize the major differences between the Archean and Proterozoic. When did the Proterozoic begin and end? What will be an ideal response?
The Proterozoic time unit began 2500 million years ago, and ended 542 million years ago.
Archean crustal evolution was dominated by the production of granite-gneiss complexes and
intervening greenstone belts; life originated in this time, and was exclusively prokaryotic. In
the Proterozoic, ophiolites and sandstone-carbonate-shale sequences indicate essentially
modern tectonic processes dominated by Wilson cycles. Proterozoic life started with
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Indicate whether the statement is true or false
When a paper clip is brought near a bar magnet, domains in the paper clip are
A. repelled by the bar magnet. B. induced into alignment. C. both of these D. neither of these
What does the Gulf Stream do?
A. Distributes heat to the South Atlantic B. Distributes heat to the North Atlantic C. Distributes heat to the Gulf of Mexico
Instructions: Choose one answer from each pair of selections. In most tropical regions, the seasons are marked by differences in TEMPERATURE | PRECIPITATION