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Across 3. _____ rocks are melted, cooled, or hardened 9. Layer of the atmosphere that is clear and dry. 11. ________ clouds often a sign that rain or snow is coming. 13. The basic shape that minerals tend to take is a _________ 15. ________ rocks are changed by heat or pressure 17. The color of the mark that a mineral leaves on a white unglazed porcelin is called _______. 18. __________ is a measure of how well a mineral resists being scratched 19. Igneous rocks can be classified as ______ or extrusive. 22. ______ rocks are pressed together and cemented 24. Hot liquid rock inside the earth 25. This layer absorbs ultraviolet radiation from the sun (2 words) 26. A strong and reliable wind belt. 27. ______ is the tendency of minerals to break along flat planes or surfaces.

Down 1. Also called the thermosphere. 2. The tendency of minerals to break unevenly leaving jagged edges is _______. 4. Because the _______ of minerals may vary, it is a less certain way than other properties to identify minerals. 5. ______ is a comparison of a mineral's weight to the weight of the same volume of water (2 words). 6. ________ clouds are a sign of fair weather. 7. The _____ is about 2,800 km thick. 8. Metamorphic rocks can be classified as foliated or _________. 10. The _______ (2 words) describes how a rock may be changed from igneous to sedimentary to metamorphic. 12. __________ is the way a mineral picks up or reflects light. 13. To change from a gas to a liquid. 14. This layer is the narrowest layer 16. Hardness is measured on the _____ scale. 20. To change from a liquid to a gas. 21. ________ clouds often bring rain. 23. The three types of sedimentary rock are _______, organic and chemical.