Chapter 2: Weathering and Soil Formation

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Across 1. Soil found in the A-Horizon 4. Plant and leaf materials on the surface, also called the O-Horizon 6. Organisms that break down the remains of dead organisms. 8. Decayed plant and animal remains. 10. Freezing of water that eventually cracks rocks. 14. Loose weathered material on Earth's surface. 18. A section of the US that lost much of its top soil to wind erosion. 19. Solid layer of rock beneath the soil 20. Movement of rack particles by wind, water or ice. 21. Plowing that disturbs the land as little as possible. 22. A thick mat of roots at the surface, hold soil in place and hold onto moisture.

Down 2. A rock that has tiny connected air spaces 3. Breaking down of rock by physical means, into smaller pieces. 5. Soil composed of equal parts sand, silt and clay 7. Breaking down of rock through chemical changes 9. Caused by burning too much fossil fuels. 11. The practice of protecting our soil resources 12. Plowing along the slop of the land. 13. The original source of the soil. 15. Soil found in the B-Horizon, composed with clay particles 16. Two factors that affect the rate of weathering are type of rock and _____________. 17. Wearing away of rock by the grinding of other rock particles

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