nsTeam1RO, nsTeam1RW, nsTeam1_talkRO, nsTeam1_talkRW
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New page: Term used to describe volcanic rock or magma composed chiefly of dark-colored, iron- and magnesium-rich minerals. (Miller, 1989) <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminolog...
Term used to describe volcanic rock or magma composed chiefly of dark-colored, iron- and magnesium-rich minerals. (Miller, 1989) <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>
==References==
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==References==
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