Rocks can be found on many planets and moons, but we know of the widest variety of them on the what?\nOptions:\n- ground\n- waterfall\n- surface of earth\n- museum\n- atmosphere Hmmm, let me think.
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Rocks widest variety is found on earth. Question mentions about planets and moons, so earth is the most appropriate answer.
So, the answer is surface of earth.
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