mantle Transform fault boundaries inner core Seismic waves core Primary waves rock cycle Secondary waves geothermal gradient Aftershocks continental drift Focus ridge Tsunami sea-floor spreading Volcanic ash continental crust Obsidian oceanic crust Pangaea Plate tectonics Divergent boundaries Convergent boundaries Subduction zone Plateau Earthquake Hot spot
mantle inner core core rock cycle geothermal gradient continental drift ridge sea-floor spreading continental crust oceanic crust Pangaea Plate tectonics Divergent boundaries Convergent boundaries Subduction zone Plateau Earthquake Hot spot Transform fault boundaries Seismic waves Primary waves Secondary waves Aftershocks Focus Tsunami Volcanic ash Obsidian
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