Weathering and Soil
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ACROSS
4. These soils generally get less than 25 cm of rain per year, which results in high levels of accumulated salts.
6. ____ wedging The repeated thawing and freezing of water in the cracks of rocks.
8. These soils experience high temperatures and heavy rainfall, which leads them to often become infertile.
11. ____ weathering. Rocks and minerals decompose (undergo changes in their composition) as a result of reactions with other substances.
13. The chemical reaction of oxygen with other substances.
14. Horizon A is the surface layer which is usually dark-colored and rich in humus.
16. Type of precipitation produced when sulfur dioxide and nitrogen oxides emissions combine with oxygen and water in the atmosphere.
17. ____ soil. Soil located above its parent material.
18. With more than 50cm of rainfall per year, these soils vary greatly and may contain large amounts of humus.
19. ____ soil. Soil that has been moved to a location away from its parent bedrock.
 DOWN
1. The reaction of water with other substances.
2. Horizon B is less-developed than Horizon A soil, and often contains soluble minerals that have been washed out from the topsoil.
3. The process that involves the breaking down and changing of rocks and material on or near the Earth’s surface.
5. The removal and movement of weathered materials from one location to another.
7. ____ weathering. The disintegration process by which rocks and minerals break down into smaller pieces.
9. The process by which outer layers of a rock are stripped away.
10. The loose covering of broken rock particles and decaying organic matter overlying the bedrock of Earth’s surface.
12. These soils form at high latitudes and high elevations and usually have good drainage but no distinct horizons.
15. soil ____. A vertical sequence of soil layers.