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Rainmaker Mountain : ウィキペディア英語版 | Rainmaker Mountain
Rainmaker Mountain (also known as North Pioa Mountain) is the name of a mountain located near Pago Pago, American Samoa on Tutuila Island. The mountain is a volcanic feature known as a trachyte plug. This means that it is a volcanic intrusion made of extrusive igneous rocks having alkali feldspar and minor mafic minerals as the main components and a fine-grained, generally porphyritic texture. The average annual rainfall on the mountain is around 200 inches (5 m). The mountain is a National Natural Landmark designated in 1972. ==References==
* http://www2.nature.nps.gov/geology/parks/npsa/index.cfm
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Rainmaker Mountain」の詳細全文を読む
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