By analyzing the seismograms from many earthquakes, scientists have discovered that three main levels or shells exist within the Earth:
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Layers of the Earth
![[earthcrust]](images/crustball.gif)
CRUST
![[earthmantle]](images/mantleball.gif)
MANTLE
![[earthcore]](images/coreball.gif)
CORE
Layers of the Earth
CRUST
MANTLE
CORE