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Divergent plate boundaries in oceans Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.
Introduction to Plate Tectonics The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.
Volcanoes & Earthquakes Look up active volcanoes and earthquakes worldwide on our web-app, featuring an interactive map you can embed on your website or use as stand-alone tool.