GEOL 101 Lecture Notes - Lecture 5: Silicate Minerals, Newberry Volcano, Feldspar
18 Oct 2016
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Document Summary
Igneous rocks igneous rocks form as molten rock (magma/lava) cools and solidifies. Volcanic rocks (extrusive: rocks formed from lava, tend to be fine grained and often glassy in appearance. Plutonic rocks (intrusive: rocks formed from magma at depth. Cinder: chunks of cooled lava that turn solid. Lava tubes lava stays under the surface and acts as a pipe for the lava to flow directly into the ocean. Viscosity: described how fluid the lava is low viscosity = very fluid (and vice versa) Magma: three basic components liquid portion - melt. Volatiles - dissolved gases in the melt (including h2o, co2, and. Volcanic activity has a great impact on the atmosphere the gases are what determine the explosiveness. Examples of the earth because of all of the gases: hawaii has low silica lava (low viscosity) Basalt flows out fluid-like: newberry volcano in oregon has high silica lava (high viscosity)
