This is important! There will be a test later.... Felsic equals - TopicsExpress

This is important! There will be a test later.... Felsic equals high in Silica and Aluminum. Mafic equals high in Iron and Magnesium. Basic and Mafic are equivalent terms. Felsic or Silicic and Acidic are equivalent terms. To very much over simplify, Basic rocks like Basalt equal runny lavas as in the Hawaiian Islands. Felsic or Silicic lavas like Rhyolite/Obsidian form domes and very pasty flows (like toothpaste) as in Mount Rainier or Mount St Helens in Washinton or The Medicine Lake Highlands in California.

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