Gilkey - Inside Restless Earth - C. 4

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Meaning
Term
The thin, outermost layer of the Earth, or the uppermost part of the lithosphere   crust  
the outermost, rigid layer of the Earth that consists of the crust and the rigid upper part of the mantle   lithosphere  
the strong, lower part of the mantle between the asthenosphere and the outer core   mesosphere  
the soft layer of the mantle on which pieces of the lithosphere move   asthenosphere  
the liquid layer of the Earth's core that lies beneath the mantle and surrounds the inner core   outer core  
soild, dense ball of iron   inner core  
the theory that continents can drift apart from one another and have done so in the past   continental drift  
all the Earth's land masses joined together were once called this   Pangaea  
as tectonic plates move away from each other, the sea floor spreads apart and magma rises to fill in the gap   sea-floor spreading  
the theory that the Earth's lithosphere is divided into tectonic plates that move around on top of the asthenosphere   plate tectonics  
process by which hot material from deep within the Earth rises while cooler material near the surface sinks   convection  
when two tectonic plates push into one another, this is the boundary where they meet   convergent boundary  
when two tectonic plates move away from each other this is the boundary they create between them   transform boundary  
this is used to measure the rate of tectonic plate movement   Global Positioning System or GPS  


   

 
 

 
 

 

 

 
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