What is the difference between active and passive diapirism and how can we distinguish between them?
What will be an ideal response?
Ans: During active diapirism the salt forces its way upward through the overburden, driven by some sort of loading, for example differential loading (a heavier load next to the diapir making salt flow into the diapir). In passive diapirism diapirs continually rise as sediments are deposited around them. The crest of passive diapirs are at or close to the surface while active diapirs may be deeper. Active diapirs show evidence of forceful intrusion by means of rotated flaps of what was once roof layers, while layers around passive diapirs are only gently rotated due to compactional effects that may create minibasins next to the salt structure.
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The light bleached color of dying coral in marine ecosystems is most likely the result of
A) exposure to increased levels of sunlight. B) increased ocean temperatures. C) increased pH of the ocean. D) shifts in ocean currents.
Scientists believe that a growing amount of this gas in the atmosphere will probably bring about continued warming of the lower atmosphere
A) argon B) carbon dioxide C) oxygen D) nitrogen E) hydrogen
An area defined by characteristic, long-term weather patterns is called
A) an ecosystem. B) a climatic region. C) a biome. D) an average weather place.
Precipitation is most abundant where the air rises; least abundant where it sinks
a. True b. False