GEOG 1350 Lecture Notes - Lecture 4: Return Period, Vog, Mount Pinatubo
14 Feb 2017
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Document Summary
Volcanoes: most volcanoes are located near plate boundaries, 2/3 of all volcanoes are found on the ring of fire" surrounding the. Is found deep within the crust and mantle. Is flowing from an erupting volcano: essentially, lava is magma on the earth"s surface. Magma: the most abundant elements in magma are silicon and oxygen; when combined they are referred to as silica. Volcanic rocks are named based on the amount of silica present: types of volcanic rocks: basalt, andesite, dacite, rhyolite. Viscosity: magma also contains small amounts of gases (water vapour and carbon dioxide), volcanoes have different shapes based on the chemistry and viscosity of their magma. Magma viscosity is determined by silica content and temperature. Magma: rhyolitic and dacitic magmas produce explosive eruptions. basaltic and andesitic magmas produce eruptions the tend to flow. Types of volcanoes: volcanoes are classified into 4 different types, the classification is based on their shape, appearance, and style of eruptions, types of volcanoes:
