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