chapter_04_lec modified

chapter_04_lec modified - Volcanism and Extrusive Rocks...

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Steve Kadel, Glendale Community College Volcanism and Extrusive Rocks Physical Geology 11/e, Chapter 4
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Volcanism and Earth’s Systems Atmosphere originally created from gases released by magmas Hydrosphere produced by condensation of volcanic water vapor Biosphere both positively and negatively influenced by volcanism Lava flows and ash weather to produce fertile soils Violent eruptions can destroy nearly all life in their paths Large amounts of ash and volcanic gases in atmosphere can trigger rapid climate changes and contribute to mass extinctions
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Volcanic Eruptions Lava is produced when magma reaches Earth’s surface Explosive eruptions can produce rapidly cooled rock fragments called pyroclasts Size range from dust ( ash ) to boulders ( blocks and volcanic bombs ) Calm oozing of magma out of the ground produces lava flows Pyroclastics and lava flows form extrusive igneous rocks Lava flows and pyroclasts pile up to form volcanoes
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Living with Volcanoes Mythology, religion and volcanoes Hawaii - Pele Iceland - Loki Growth of volcanic islands (Hawaii)
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This note was uploaded on 06/13/2011 for the course GEOL 1403 taught by Professor Mulcahey during the Spring '11 term at Lone Star College System.

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chapter_04_lec modified - Volcanism and Extrusive Rocks...

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