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15 Cards in this Set
- Front
- Back
VOLCANOES |
PLACES WEHRE MOLTEN ROCK (MAGMA) RISE TO THE CRUST OF THE EARTH |
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LAVA |
MAGMA ERUPTED ONTO THE SURFACE |
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VISCOSITY |
STICKINESS OF MAGMA HOTTER=LESS VISCOUS SILICA CONTENT HAS GREATEST INFLUENCE |
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cause of volcanoes |
plate tectonics, and movement of plates -mostly in subduction zones -where one plate goes underneath another one and melts into magma |
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magma |
liquid rock/metled rock -produced underneath earths surface -temperature of rock gets above melting point of rock and melts - |
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location of volcanoes |
convergent boundaries= subduction zones divergent= rifts pacific ring of fire |
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subduction zones |
where one tectonic plate moves under another |
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mid ocean ridges |
popular spot for volcanos -when oceans split under water |
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hot spots |
far away from plate boundary - |
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shapes of volcanoes |
-CINDER CONES -SHIELD -COMPOSITE -DOME COMPLEXES |
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CINDER CONES |
-TEND TO BE IN THE MIDDLE OF CONTINENTS BECAUSE ITS PYROCLASTIC. -MORE EXPLOSIVE - |
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SHIELD VOLCANOES |
MOSTLY MADE OF MAFIC ROCK OR BASALT ROCK.LARGEST MOUNTAINS ON EARTH. ACTIVE. BASALTIC MAGMA=LOW SILICA HIGH GAS LAVA FOUNTAINS HAWAII |
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COMPOSITE VOLCANOES |
STEEP, ALTERNATING LAYERS OF LAVA AND PYROCLASTIC |
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DOME COMPLEXES |
SMALL, OVERLAPPING DOMES, HAPPEN IN VISCOUS LAVA FELSIC MAGMA= HIGH IN SILICA SUBDUCTION ZONES RING OF FIRE |
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FISSURE VOLCANOE |
BASALTIC MAGMA DIVERGENT PLATE BOUNDARIES SOFT BASALTIC LAVA SLOPE MID OCEAN RIDGES LIKE ICELAND |