Mantle and Crust - John Seach

The mantle is the solid region of the earth between the crust and core.
The mantle is 2850 km thick.

The overlying crust varies from 7 km in oceanic regions to 70 km in the Himalayas.
Magma is generated by melting of the mantle.

Hot spot volcanoes are generated by plumes originating at the core - mantle boundary.
The few dozen hot spot locations represent a different form of volcanism.
 

Mantle and Crust
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Copyright John Seach