Across
- 3. Rock formed from magma or volcanic lava
- 7. The movement of sediment from one place to another
- 9. A type of igneous rock
- 11. A beautiful but more common type of gemstone
- 12. A type of sedimentary rock
- 14. Melted rock underground
- 16. A type of gemstone that is beautiful and rare
- 17. The wearing away of the earth
- 21. The color of the mark made when a mineral sample is rubbed on a harder surface
- 22. a rock-like substance that forms from decayed plant matter
- 23. A substance made of things that were never alive
- 25. The way a mineral reflects light
- 26. Magma that flows from an opening onto the earth's surface
- 27. The ability of a mineral to resist scratching
Down
- 1. Organic particles in the soil that forms from decayed plants and animals
- 2. Scientists who study the structure, rocks, and minerals of the earth
- 4. Small bits of weathered rock
- 5. Rock formed by heat and pressure deep below the earth's crust
- 6. A hard, natural substance made of one or more minerals
- 8. The center of the Earth
- 10. A type of metamorphic rock
- 11. Rock that forms when layers of sediment and organic material harden
- 13. The thin outer layer of the earth
- 15. The layer of hot rock that makes up most of the earth's mass
- 18. An inorganic substance found naturally in the earth's crust
- 19. A mineral that can be cut and polished for use
- 20. The scale used to determine the hardness of minerals
- 24. The characteristic of a mineral to break along smooth, straight lines or into flat sheets
- 28. The loose material on the surface of the earth in which plants can grow