Soil Formation

1. Type of soil that forms in drier, temperate areas where grasslands and brush are the usual types of vegetation.
3. An organic material that can be burned for energy.
4. Given enough time, rock is weathered to produce a layered soil, called a soil _______.
6. Fertile soils are rich in ________, contain a high percentage of organic materials, and are usually black or dark brown in color.
7. The darkest layer of soil-also called the A Horizon.
9. Organic material can be added to soil to help increase this.
11. The type of soil that North Carolina has.
12. The decayed remains of plant and animal life in soil.
13. Type of soil found in tropical rainforests.

2. A soil that has an equal mixture of sand, silt, and clay.
3. A _________________ soil allows water to flow through it easily because the spaces between the inorganic particles are large and well connected.
5. Many farmers plant this to create windbreaks which reduce erosion. Especially, wind erosion.
7. One of several types of soil characteristics listed in the reading.
8. The most important factor determining soil type
10. Increased _________ increases the rate of chemical reactions, which also increases soil formation.