Volcanism

• Volcanism


  a mechanism by which magma rises onto Earth's crust through a volcanic vent and flows along Earth’s surface
• Spreading Center


  commonly occurs at divergent plate boundaries in the ocean floor.
• Subduction Zone


  when two plates diverge, move away from each other, and collide with the other plates next to them.
• Intraplate Hotspot


  volcanic activity that takes place deep within Earth's interior region.