felsic to intermediate - Si rich, high viscosity, thick magma, light color, often gas rich, explosive, lahars, pyroclastic flows, nuee ardente, tuff, ash, strato-volcanoes or conposite volcanoes

mafic - iron and magnesium rich, Low in Si, low viscosity magma, lava flows, gentle, aa, pahoehoe, dark color, shield volcano, cinder cones, spatter cones

Subduction related: Mt. Shasta, 10,000 years, 1786?, not glaciated; Mt. Lassen; 1914, Mt. Tehama, Brokeoff mountain, Rockland ash, glaciated,

extension related, Basin and Range (mostly last 22my), stretches and thins crust (lithosphere), mafic volcanos, Medicine Lake Highlands, 700,000 years, shield volcano, cinder cones, spatter cones, minor young silica-rich domes and flows; Lava Flow National Monument, lava flows from vents on the north flank of the shield volcano, lava tubes, Mojave desert, young from north (10 my) to south, mostly cinder cones and lava flows, related to northward extension of rift zone?

felsic and bimodal volcanos: Long Valley Caldera, 3.6 my mafic flows, 2 my felsic eruptions, 760,000 major eruption, Bishop Tuff, caldera (2-3km deep, 17x32 km), 200,000 year recurrence interval?, currently magma at 5-15km; Mono-Inyo, rhyolite and obsidian domes and flows, Panum crater (650 years), Inyo craters (530 years); Coso volcanics, 6 million years, bimodal - mafic flows and felsic domes

Compare and contrast felsic and mafic volcanos in terms of: chemical composition, magma viscosity, style of eruption, rocks produced

Explain how subduction causes volcanos and describe two volcanos that are related to subduction.

Explain how extension causes volcanos. Why are some extension related volcanos mafic while others are bimodal? Describe an example of a mafic, extension related volcano, and a bimodal, extension related volcano.

Describe the Long Valley Caldera. What is a caldera? When and where was the eruption? What was the eruption style? What rocks were produced? How large was the eruption? How is it related to the Mono-Inyo domes and craters? What is its current status?