Geob lect 2p2.docx

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Department
Geographical Biogeosciences
Course
GEOB 103
Professor
Carles Ferrer- Boix
Semester
Spring

Description
Geob lect. 2 p2 01/16/2014  Types of volcanoes How & why rocks melt How does magma generation relate to plate tectonics Why are there different types of volcanoes and volcanic eruptions What hazards do volcanoes present Volcano: Hills, ridges, mountains formed by accumulation of lava flows and pyroclastic flows that deposit  around the conduit or center depression from which volcanoes erupted.  Shape of the conduit Types of eruption Types (Slide 43) 1. Cinder volcano – Small, pyroclastic flows 2. Shield volcano – (small­giant) thing layers of lava flows 3.Composite Volcano 4.Dome complexes – rhyolitic composition How & Why rocks melt (slide 52) Melting temp. depends on the minerals Temp is affected by: Pressure, and water.  There is a linear relationship between pressure and melting temp. for each particular mineral. A mixture of minerals in the rock causes the rock to melt at lower temp. Rat
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