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Volcano
(redirected from volcanism)

   Also found in: Dictionary/thesaurus, Legal, Encyclopedia, Wikipedia 0.01 sec.
Volcano
An opening or rupture in the earth’s surface through which lava, hot gases, and fragments of rock erupt. The effect of volcanic eruptions on humans is both direct—lava flow, tidal waves, mud slides—and indirect—releasing ash that affects the lungs or weather


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Then, the eruptions abruptly stopped, and atmospheric carbon levels fell well below what they were in the time before volcanism.
Unique geological sequences, volcanism, tectonic faults and glaciers have also generated valuable mineral and metal deposits including zinc, copper, nickel, lead, titanium, uranium, diamonds and gold.
[ILLUSTRATION OMITTED] Fire under ice Thick layers of volcanic ash (above, ash samples shown in inset) blanketing a patch of Arctic seafloor point to explosive volcanism at a depth greater than 4,000 meters, a phenomenon scientists long thought impossible because of the immense pressures at such depths (SN Online: 6/25/08).
 
 
 
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