ROCKS

1. A naturally occurring inorganic solid with a specific chemical composition and a definite crystal structure.
3. The way that a mineral reflects light from its surface.
6. Valuable minerals that are prized for their rarity and beauty.
8. Form when lava or magma cools and minerals crystallize.
9. The color of a mineral when it is broken up and powered.
10. Dark colored, low silica, contains plagioclase and pyroxene (gabbro).
11. Minerals that break with rough or jagged edges.
16. Which is the ratio of the mass of a substance to the mass of an equal volume of water at 4 degrees C.
18. Magma cools and crystallizes, minerals form in predictable patterns.
20. Magma that flows out onto Earth's surface.

2. Magma that cools and crystallizes below Earth's surface.
4. Minerals that contain silicon and oxygen and usually one or more other elements.
5. Similar to partial melting in that the composition of magma can change.
7. Magma that cools and crystallizes on Earth's surface.
12. melting. The process whereby some minerals melt at relatively low temperatures while other minerals remain solid.
13. A solid in which the atoms are arranged in repeating patterns.
14. A mineral that contains valuable substance that can be mined at a profit.
15. A measure of how easily a mineral can be scratched.
17. A mineral that splits relatively easily and even along one or more flat planes.
19. Geometric solid having four sides that are equilateral triangles resembling a pyramid.