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Download 8th grade Volcano Notes
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Volcano Notes A. Volcano—mountain which releases igneous materials a. Strato volcanoes—layers of lava and ash (also called composite) i. Examples—Mt Rainier and Mt Hood b. Dome volcanoes—thick rhyolite lava i. Example—Mt Lassen c. Shield volcanoes—thin layers of basalt lava i. Example—Hawaiian volcanoes d. Cinder cones—piles of lava fragments i. Example—Lava Butte B. Types of eruptions a. Quiet—lava boils over and gas is released slowly and steadily i. Example—Hawaii b. Explosive—gas and igneous materials are released in short bursts i. Example—Mt St Helens ii. Caldera formation 1. Collapse of a volcanic cone a. Example—Crater Lake c. Strombolian—gas and igneous materials are released steadily and rapidly i. Example—Stromboli (Italy) C. Causes of volcano formation a. Hot spots in the crust—Hawaii b. Subduction zones—Cascades, Andes c. Mid-ocean ridge—Iceland
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