Plate tectonics

What is plate tectonics?
Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core.
 
Whats the difference between S and P waves?
Although both can pass through solid rock, only P-waves can also pass through gases and liquids.
 
How are volcanoes formed?
Most volcanoes are formed by the movement of tectonic plates on the surface of the earth.
 
What does the richter scale do?
It is the magnitude scale for earthquakes.
 
What is Pangea?
Was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.
 
What is the effect of sea floor spreading?
Where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
 
What does sea floor spreading help explain?
Helps explain continental drift in the theory of plate tectonics.
 
Where is the asthenosphere located?
The upper layer of the earth's mantle, below the lithosphere
 
Where is the lithosphere located?
The rigid outer part of the earth, consisting of the crust and upper mantle.
 
What is a fault?
(of a rock formation) be broken by a fault or faults
 
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