Roughly 7! 7 x 48 is 336 which is two short so maybe just say 8 to be safe.
Three seismic stations are needed to determine the location of an earthquake's epicenter.
The answer is B. In a destructive plate boundary, the descending plate, usually the oceanic plate begins to melt as it descends below into the mantle. This forms magma that rises and erupts onto the overlying continental plate through fissures. This volcanic activity is responsible for geographical features such as the volcanic island arc, which lies parallel to the subduction zone.
