Seismograph - An instrument used to record data about earthquakes., Earthquake - A sudden, violent shaking of the ground caused by movement of giant plates in the earth's crust., Natural Disasters - Natural events that can cause great damage., Tsunami - A huge ocean wave caused by a disturbance in the ocean floor. Usually caused by an underwater earthquake., Volcano - An opening on Earth's surface that allows molten rock, called magma, to escape from inside the earth., Magma - Molten rock inside the earth., Earth's Plates - Large, moving slabs of rock that make up the planets outer layer., Earth's Crust - The outermost layer of the planet.,

Natural Disasters

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