AS A VOLCANO ERUPTS WHAT MAKES CERTAIN LANDFORMS?? VOLCANIC LANDFORMS om/watch?v=wI1wlXJz 1lk.
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Transcript of AS A VOLCANO ERUPTS WHAT MAKES CERTAIN LANDFORMS?? VOLCANIC LANDFORMS om/watch?v=wI1wlXJz 1lk.
A S A V O L C A N O E R U P T S W H A T M A K E S C E R T A I N L A N D F O R M S ? ?
VOLCANIC LANDFORMS
https://www.youtube.com/watch?v=wI1wlXJz1lk
• Billy Nye Volcanoes • https://www.youtube.com/watch?v=IbDZBVLbFJ4
FROM LAVA AND ASH
SHIELD VOLCANO
• Lava flows out gradually building a wide gently sloping mountain • Gentle eruptions https://www.yo
utube.com/watch?v=HdhARb2PGqA Start at 1:11
CINDER CONE VOLCANO
• When lava has a high viscosity it produces ash, cinder and bombs which all build up around the vent in a steep, cone-shaped hill (or small mountain)• https://
www.youtube.com/watch?v=HdhARb2PGqA
FORMED BY LAVA AND ASHCOMPOSITE VOLCANO
• Tall, cone shaded mountains in which layers of lava alternate with layers of ash • Most violent eruptions• https://www.youtube.com/watch?v=-H_HZVY1tT4
https://www.youtube.com/watch?v=HdhARb2PGqA Start 1:39
FORMED BY LAVA AND ASHLAVA PLATEAUS
• High, level Ares that have been built up over time from lava seeping out of several cracks then traveling a distance before cooling and solidifying• Formed from fissure volcanoes
FORMED BY LAVA AND ASHCALDERA
• https://www.youtube.com/watch?v=BBGmXsZHInw • Huge hole left by the collapse of a volcanic
mountain • Composite volcanoes
FROM MAGMA
VOLCANIC NECKS
• Forms when magma hardens in a volcano's pipe• softer rock and round the pipe erodes away
exposing hard rock.
DIKES
• Formed when magma forces itself across rock layers and hardens• Made from composite volcanoes• Vertical layers• https://www.youtube.com/watch?v=6loGYTCBVqo
SILL
• Formed when magma forces itself across rock layers and hardens • Horizontal layers
BATHOLITHS
• Mass or rock formed when a large body of magma cools inside the crust • “Half Dome”
DOME MOUNTAIN
• Forms when an uplift pushed a batholith or smaller body of hardened magma toward the surface.
GEOTHERMAL ACTIVITY
• Magma, a few km under earths surface, heats underground water and forms ….
• Hot Springs• Geysers
HOT SPRINGS
• Groundwater is heated by a nearby body of magma or hot rock and eventually rises to the surface to collect in a natural pond. • Can also heat streams
GEYSER
• Fountain of water and steam that erupts from the ground when a buildup of pressure is released• https://www.youtube.com/watch?v=_gyhvqbIaOE