13.12: Weathering and Soils- Challenge 2

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1. Soil that is so rich in organic matter that it can be burned is called ___.: peat

2. Any material through which water (or any other liquid or gas) can move through is ___.: permeable

3. The rock and mineral contents of soil are ___, while humus is organic.: inorganic

4. In a soil profile, deeper horizons are ___ altered and ___ like the original rock.: less; more

5. Iron oxide and clay accumulate in the ___ of the soil profile.: subsoil

6. ___ has the highest proportion of organic matter in the soil profile.: Topsoil

7. ___ can bake as hard as a brick if exposed to the Sun.: Laterite

8. The rate of soil formation under ideal conditions--intermediate topography, proper climate, and a good balance of organisms--is ___.: 1 mm/year

9. ___ forms in tropical rainforests.: Laterite

10. To reduce erosion in cities, ___.: include green spaces where plants can grow

11. Crop rotation, planting nutrient-rich cover crops, and alternating the types of crops planted in each row all help prevent ___.: soil erosion

12. Preventing soil erosion ___ crop yields and ___ existing ecosystems.: improves; protects