Encyclopedia of earthquakes and volcanoes

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The Earth is a circle that is straightened at the shafts and swelling at the equator. 
Inside, it resemble a hard-bubbled egg. In the middle, rather than a yolk, it has a center. 

The center is made out of iron-nickel and contains an inward center that is strong and 
an external center that is fluid. The turning of the Earth causes the two to interface as a self-energizing dynamo that gives Earth its solid attractive field. 

The egg white is comparable to the Earth's mantle, which encases the center. The mantle is 

made out of thick minerals that are rich in iron and magnesium. It has a few layers reflecting distinctive minerals and mechanical properties. The shell of the egg is 
proportional to the Earth's hull, a meager layer of light shake whereupon people live. 

Dissimilar to the shell, which is uniform, there are two sorts of hull. Meager, thick, youthful 

outside layer is pulled toward the focal point of the Earth by gravity and sinks down, though thick, light, old covering drifts higher. The more profound hull is secured by seas and 
called maritime hull, while the lighter outside structures the mainlands and is called 
mainland hull. The idea of isostasy is the harmony between them.

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