cliff - A steep, high rock face with a sharp drop to the ground below., boulder - A large, rounded rock that is resting on or in the ground, planet - A large object in space that moves in a regular path around the sun or some other star., balance - To hold something in a steady position without letting it fall., machine - An object with moving parts that is used to do certain kinds of work., slope - A surface, a line, or a piece of land that is higher at one point than at another., joint - The place where two parts meet or come together., antenna - A metal rod or wire used to send and receive radio and television messages., muscle - A part of the body that can be stretched or tightened to make the body move., motor - An object that provides the power to make something move or do work.,

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