Environmental Studies

A Dictionary of Ecology A Dictionary of Earth Sciences Further reading

basic rock

A Dictionary of Ecology | 2004 | | Copyright

basic rock Rock that has a relatively high concentration of iron, magnesium, and calcium, and with 45–53 per cent of silica by weight. Examples include gabbro, which is a coarse-grained basic intrusive rock, and basalt, which is a fine-grained basic volcanic (extrusive) rock. See also alkaline rock. Compare acid rock and intermediate rock.

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MICHAEL ALLABY. "basic rock." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "basic rock." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O14-basicrock.html

MICHAEL ALLABY. "basic rock." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-basicrock.html

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basic rock

A Dictionary of Earth Sciences | 1999 | | Copyright

basic rock Rock with a relatively high concentration of iron, magnesium, and calcium, and with 45–53% of silica by weight. Examples include gabbro, which is a coarse-grained basic intrusive rock, and basalt, which is a fine-grained basic volcanic (extrusive) rock. Compare ACID ROCK; and INTERMEDIATE ROCK. See also ALKALINE ROCK.

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AILSA ALLABY and MICHAEL ALLABY. "basic rock." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "basic rock." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-basicrock.html

AILSA ALLABY and MICHAEL ALLABY. "basic rock." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-basicrock.html

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