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Across 1. dark-colored organic material in soil 5. description of a substance that turns blue litmus paper red 7. grinding away of rock by other rock particles carried in water, ice, or wind 9. rich, fertile soil that is made up of about equal parts of clay, sand, and silt 12. physical characteristic that allows water to seep through 14. natural inorganic solid with crystal structure and chemical composition 16. measure of how well soil supports plant growth 17. process of melting ore to seperate useful material from other elements 21. anything in the environment that humans use (2 words) 23. natural resource that is not replaced in a useful time frame (2 words) 26. the varitey of components that make up the topmost layer of soil 28. description of a substance that turns red litmus paper blue 30. plowing fields along the curves of a slope to prevent soil loss (2 words) 31. process that breaks down rock through chemical changes (2 words) 33. earth materials deposited by erosion 34. loose layer of dead plant leaves and stems on the surface of the soil 35. planting of different crops in a field each year to maintain the soil's fertility (2 words) 36. anything in the environment that humans use (2 words) 38. method used to hold the soil in place by keeping dead stalks from the previous harvest (2 words)

Down 2. layer of soil beneath the topsoil 3. layer of soil that differs in color and texture from the layers above or below it (2 words) 4. process by which water, ice, wind, or gravity moves weathered rock or soil 6. Great Plains area in the 1930s where wind erosion caused soil loss (2 words) 8. rock formed when particels sediments are pressed and cemented together (2 words) 10. solid rock beneath the soil 11. formed when rocks are changed by pressure, heat or chemical reaction (2 words) 13. chemical change in which a substance combines with oxygen 15. management og soil to prevent its destruction (2 words) 18. solid in which atoms are arranged in a repeating pattern 19. weathering in which rock is physically broken into smaller pieces (2 words) 20. process of splititng rocks by water seeping into cracks, freezing and expanding (2 words) 22. organism that breaks down wastes and dead organisms 24. principle stating the geologic process operating today operated in the past 25. the series of processes that change rocks from one type to another (2 words) 27. rock formed by the cooling of melten rock (2 words) 29. rock that contains a metal or useful mineral 32. chemical and physical processes that break down rock at Earth's surface 37. thick mass of grass roots and soil 39. loose, weathered materials on Earth's surface in which plants can grow