Geologist - Scientist who studies rocks, Sand - Very tiny pieces of rock, Pebbles - Small rocks sometimes called gravel, Cobbles - Rocks larger than pebbles and sometimes used to make walkways, Boulders - Largest sized rocks, Minerals - Solid pure substances that occur naturally, Gem - Piece of a mineral that is cut and polished to be used in jewelry, Halite - Another name for salt, Cube - Shape of halite crystals, Minerals found in the rock granite - Feldspar, quartz, and mica, Mohs rating: Talc - 1, Mohs rating: Feldspar - 6, Mohs rating: Diamond - 10, Gypsum - Used to make sidewalk chalk, Quartz - Used to make sandpaper, Gold - Used to make jewelry,

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