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Science

TermDefinition
Magma Molten mixture of rock forming substances from the mantle
Lava Liquid magma when it reaches the surface and hardens to make lava
Why do so many volcanos occur at plate boundaries? Huge pieces of crust diverge or converge so the crust often fractures. allowing magma to reach the surface.
Volcano A weak spot in the crust where magma has come to the surface.
Ring of Fire A major belt of volcanoes that rims the Pacific Ocean.
Island Arcs A string of islands formed by the volcanoes along a deep-ocean trench
Greater Viscosity Slower liquid flows
Lower viscosity= quicker liquid flows
Low viscosity liquids= Orange Juice, Milk
More silica = High viscosity
Less silica= Low viscosity
Increase Temperature= Decrease Viscosity
Decreased temp= Increase viscosity
Pahoehoe hot low viscosity fast flow
AA cool higher viscosity slower flow
Vocanic Ash Fine rocky particles as small as a speck of dust
Cinders pebble-sized particles
Bombs Particles ranging from the size of a baseball to the size of a car
Pyroclastic Flow The expulsion of ash cinders, bombs, and gases during an explosive volcanic erruption
Extinct Dead Unlikely to erupt again and has not in 10,000 years
Active aLive Erupting or shows signs that it may erupt in the future
Dormant Sleeping Expected to become active in the near future Difficult to classify
Shield Volcano Gently sloping mountain formed by repeated lava flow
Cinder Cone Cone-shaped mountain formed from ash, cinders, and bombs
Composite Volcano Mountain formed by lava flow alternating with explosive eruptions
Lava Plateau High, level formed by repeated lava flows
Caldera Hole left by the collapse of a volcanic mountain
Created by: 200613085
Popular Earth Science sets

 

 



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