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Volcanoes - Lesson 5 - Part 5 of 7

Volcanoes - Lesson 5 -- part 5 of 7 •Illustration show main types of extrusive igneous rocks; Basalt, andesite, & rhyolite •5 types in volcano locations along plates •Basalt -- fluid ; Aa and Pahoehoe •Temperature and silica •Basalt erupted at mid-ocean ridges form pillow lava •Pillow lava of NWT footage •Dr Ridler talking about Pillow lava in NWT •Cross-section of pillow lava •Giants Causeway quick cooling of basalt; six sided structure

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