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Across 2. The tendency of a mineral to break along flat surfaces. 4. A naturally occurring, inorganic solid with a definite crystalline structure. 7. The makeup of a rock; describes either the minerals or elements present in it. 8. The physical property of a mineral that describes how light is reflected from its surface; is defined as either metallic or nonmetallic. 10. The breakdown of rock into smaller and smaller pieces by mechanical or chemical means. 11. The amount of matter in a given space; mass per unit volume. 14. The process by which one rock type changes into another rock type. 17. Rock formed when fragments of rocks, minerals, and/or organic matter are compacted or cemented together or precipitate out of a solution. 18. The study of the solid Earth.

Down 1. Rock formed from sedimentary, igneous, or other metamorphic rock due to increases in heat or pressure. 3. The physical property of a mineral that causes it to break with rough or jagged edges. 5. The layering of sedimentary rock. 6. The color of the mineral in powdered form. Observed by rubbing the mineral on a streak plate. 9. Rock that forms from the cooling of magma. 12. A measure of how easily a mineral can be scratched. 13. Earth material made of a mixture of one or more minerals, glass, mineraloids, or organic matter. 15. The solid, geometric form of a mineral produced by a repeating pattern of atoms. 16. The removal and transport of material by wind, water, or ice.