[Geology2] Re: Tiffany Stone ?

I’m no expert, but as for #2, roughly speaking, volcanoes are the result of plate movement and subduction and the melting of the subducted oceanic plate and any overlying continental plate.  Earthquakes are also the result of fault movements, and fault movements are the result of plate movements.  Volcanoes will result in earthquakes in their general area, but not globally. 

 

Jim Van Winkle

 

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