volcano, a hill or mountain that forms over a crack in Earth's crust from which lava erupts., crater, a bowl-shaped opening at the top of a colcano or geyser, subduction zone, the place where one tectonic plate is sliding beneath another tectonic plate, descend, to move downward, hotspot, a very hot region deep within Earth's mantle where a hug magma chamber forms, plume, a column of magma that rises from the mantle into a chamber, hot spring, a naturally flowing source of hot water

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