rapid change - change to Earth's surface in seconds or minutes, surface - outermost covering of Earth, describe - to explain or tell about something using words, earthquake - sudden release of energy from under Earth's surface that makes the ground shake or crack, volcanic eruption - hot rock, ash, and gas come up from inside Earth through crack in surface, landslide - rapid downward slide of rocks and mud, slope - surface where one side is higher than another, rising/falling surface, model - to represent something by illustrating or acting it out, tsunami - huge wave that can form when an earthquake happens under the ocean, change - to make different,

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