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volcanoes eruption

Magma A molten mixture of rock-forming substances,gases, and water from the mantle
Lava Magma that reaches the surface
Viscosity The resistance of a liquid to flow
Silica A compound made up of particles of the elements oxygen and silicon
Pahoehoe Is fast-moving, hot
Aa Lava that is cooler and slower-moving
Volcanic ash Fine rocky particles as small as a speek of dust
Crater A bowl-area around a volcanoes central vent
Vent Magma leaves the volcano through this opening
Cinders Pebbled size particles
Bombs Particles ranging from the size of a baseball to the size of a car
Volcano A weak spot in the crust where molten material, or magma comes to the surface
Pyroclastic Flow When an explosive eruption hurls out a mixture of hot gases,ash,cinders, and bombs
Hot Springs When undergroundwater heated by a nearby body of magma rises to the surface and collects in a natural pool
Element A substance that cannot be broken down into other subtances
Cinder Cone Volcano When these materials pile up around the vent, forming a steep, cone-shaped hill or mountain
Composite Volcano When alterning layers form a tall, cone-shaped mountain
Shield Volcano When layers gradually build a wide, gently sloping mountain
Dike It forms when magma forces itself across rock layers and hardens
Batholith When a large body of magma cools inside the crust
Sill It forms when magma squeezes between layers of rock and hardens
Pipe This is what magma moves through
Magma Chamber When magma collects in a pocket
Dormant When a volcano is not active now but may become active in the future
Active A volcano that is currently or recently has rumbled or show signs of life
Extinct Volcano is unlikely to erupt again
Geyser A fountain of water and steam that erupts from the ground
Caldera A huge hole left by collapse of a volcanic mountain
Lava plateau A high, level area formed by repeated lava flows
Ring of Fire Formed by the many volcanoes that rim the Pacific Ocean
Created by: jjperry