What occurs near black smokers?

A. organic-rich shale burns in the subsurface
B. coal-rich layers burn in the subsurface
C. circular features (called chimneys) form, composed of sulfide and sulfate minerals
D. heated fresh water is derived from the land
E. None of these choices are correct.


Answer: C

Environmental & Atmospheric Sciences

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The __________ addresses specific targets for reducing the primary six greenhouse gases.

Fill in the blank(s) with the appropriate word(s).

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Nitrous oxide (N2O) levels have risen about 20% during the last 275 years, mostly because of ____.

A. volcanic eruptions B. thawing permafrost C. the increased use of nitrogen fertilizers D. natural gas power plants E. ozone-depleting chemicals

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Most major iron ore deposits are hydrothermal deposits formed early in the earth's history.

Answer the following statement true (T) or false (F)

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Hindus generally prefer

A) burial near a temple of their choice. B) burial in a natural setting such as a field or forest. C) cremation rather than burial. D) burial with their heads facing north. E) burial at sea.

Environmental & Atmospheric Sciences