Volcano - An opening in the earth's crust through which lava, volcanic ash, and gases escape. , Plate Boundary - The location where two plates meet., Mountain - A large and often steep landmass that is much higher than the surrounding area., Plate Tectonics - The theory that Earth's outer shell is divided into several plates that glide over Earth's mantle., Earthquake - It is a natural disaster that results due to tectonic movement in the earth's crust.,

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