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Unformatted text preview: Boats were picked up and carried ashore 4. at least 36, 417 people were killed, most by the giant sea waves, and 165 coastal villages were destroyed 5. Blue and green suns from fine ash and aerosol which circled the equator in 13 days 6. Three months after the eruption, ash had spread to higher latitudes Vivid red sunsets in New York Called out dire engines by mistake Unusual sunsets continued for 3 years 7. Volcanic dust acted as solar radiation filter Lowered global temperatures 1.2 degrees C Temperatures did not return to normal until 1888 Igneous Rocks: Last Depositional Environment Remember compositional terms? Felsic vs mafic Felsic:SiO2 (70%), Al, Na Mafic: some SiO2 (50%), Fe, Mg, Ca Materials with MORE SiO2 move more slowly Resistance to flow: viscosity Recall: SiO2 has STRONG bonds Bonds must break for flow to occur On continents, where does most volcanic material come from?...
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This note was uploaded on 03/29/2008 for the course GLG 201 taught by Professor Libarkin during the Spring '07 term at Michigan State University.
- Spring '07