What do cyclothems represent? What will be an ideal response?
Cyclothems result from repeated alternations of marine and nonmarine environments, usually in areas
of low relief. Cyclothems represent transgressive and regressive sequences with an erosional surface
separating one cyclothem from another. An idealized cyclothem passes upward from fluvial-deltaic
deposits, through coals, to detrital shallow-water marine sediments, and finally to limestones typical of
an open marine environment.
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The electric field about a proton decreases in magnitude
A. via the inverse-square law. B. when between oppositely charged parallel plates. C. in linear fashion. D. none of the above
A small lithospheric block with characteristics quite different from those of surrounding rocks;
many of these features apparently consist of seamounts, oceanic rises, and other seafloor features accreted to continents during orogenies:a. cyclothem d. organic reef b. asteroid e. terrane c. passive margin
Which of the following best indicates a location where sediment is deposited but not eroded?
A. location 1 B. location 2 C. location 3 D. location 4
If extremely cold fresh water is added on top of seawater, ________.
A. the cold water will float at the surface B. the wind will control the surface mixing C. the cold water will sink to the bottom and stagnate D. an overturn will begin immediately E. the cold water will sink and move rapidly out of the area