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steffi01

TermDefinition
crust the outer layer of the earth,it consists of oceanic and continental crust.
core is in the inner layer of the earth, consists of iron and nickel
mantle makes up over 75% of earths volume, consists of several layers of rock .
lithosphere is the name given to the crust and upper part of the mantle.
asthenosphere is the region just below the lithosphere.
plates are the large ridged sections that the lithosphere is divided up into.
convection currents are in the mantle and are the main cause of plate movements
subduction when one plate sinks below the other
fault line is the line along which the plates slide
extinct volcano are volcanos that haven't erupted in historical times
active volcano are volcanos that are currently erupting or showing signs of unrest
dormant volcanos are volcanos that haven't erupted in at least 600 years and are now quiet but have high probabilities that they'll erupt again
vent the passage that goes up through a volcano cone to allow lava to erupt onto the surface
crater is a steep sided depression found at the top of a volcano
basic lava is the lava that is high in silica, causes it to be runny
acidic lava is the lava low in silica, causes it not to be runny
lahar is when ash and dust gets mixed with rain water or melted snow during a volcanic eruption
intrusive features inside the earths curst
extrusive features on the earths surface
fissure is a long crack on the earths surface
Created by: steffi01
 

 



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