GEOL105 Study Guide - Midterm Guide: 100-Year Flood, Evapotranspiration, Impact Crater
2 Nov 2016
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What are pyroclasts: magma molten (melted liquid) rock, lava magma that flows on earth"s surface, pyroclasts exploded magma (ash, cinders, pumice, bombs) What are the 3 processes that can cause rocks to melt: decompression occurs when pressure on rock is. Happens at divergent plate boundaries, continental rifts & hot spots: addition of volatiles (chemical compounds that evaporates easily & exists as a gas water, co2) . Lowers melting temperature of rocks by helping to break chemical bonds within silicate minerals. Rocks that are close to their melting temp will melt in the presence of added volatiles: addition of heat induce melting if the temp of rocks exceeds the melting temp of silicate rocks at their depth. How does their silica content vary? (high vs low) how does their color vary? (light vs dark: basaltic low silica (mafic), dark, andesitic high silica(felsic), medium erupts from stratovolcano, rhyolitic high silica(felsic), light.
