Earth Sciences 2240F/G Chapter Notes - Chapter 7: Pyroclastic Rock, Igneous Rock, Volcanic Gas
13 Feb 2018
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Most (not all) volcanic eruptions are tied to plate tectonics. Can expect a new or continuing eruption around the rim of the pacific ocean: called the rim of fire". Stromboli off the coast of cecily erupts every 20 min 1 hour every day. Magma: molten rock, and may be a mix of hot liquids, gases, and scattered mineral crystals. When magma spills out onto the earth"s surface, it produces hot lava. When magma blows out in a violent eruption, the stuff thrown into the air is called pyroclastic material: may be in the form of blobs of hot magma, large solid blocks, or very fine pulverized material ( ash") Viscosity: property of materials that provides resistance to flow: opposite of viscous is fluid. 1) basalt: when the partial melt of earth"s atmosphere (magma) spews out of a volcano with no modification to the initial composition.
