crater - a bowl-shaped opening at the top of a volcano or geyser, crust - Earth’s outermost layer, featuring a rocky surface, erosion - any process or force that moves sediments to new locations, erupt - to send out rock, lava, and ash in a sudden explosion, fault - a crack in Earth’s crust, geologist - a scientist who studies the makeup of the earth, igneous rock - rock that forms when magma cools and solidifies, lava - red-hot melted rock that has erupted above Earth’s crust, magma - melted rock in Earth’s mantle, mantle - Earth’s largest and thickest layer, pressure - when something presses or pushes against something else, rock cycle - the continuous cycle in which rocks are created, tsunami - a gigantic wave of seawater caused by an earthquake, volcano - a hill or mountain that forms over a crack in Earth’s crust, weathering - breaking down into smaller pieces,

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