Chapter 2

3. a process at which it makes ice,water,wind,or gravity move weathered rock and soil
4. is in soil that is organic and dark colored
6. planting different crops to maintain the soil
9. is beneath the top soil and is made up of clay and other minerals
13. shows the elevation from an above view
14. a line that is labeled with the elevation of that line in round units
17. is the topmost soil and is made of clay,mixture of humus,and other minerals that form crumbly
18. a type of weathering where the rock breaks into smaller pieces
21. weathered material that is loose on earth's surface that can grow plants
22. which is a method that has dead stalks of the previous year to hold the soil in place
23. chemical change where a substance mixes with oxygen and forms rust
24. grinding way of rock that carries in water,ice,or wind into rock particles
25. is a soil organism that breaks down remains of other organisms
27. a measure which watches how soil supports plant growth
28. characteristic that has tiny air spaces at which water seeps through

1. the process which is chemical or physical that breaks rock down at earth's surface
2. fertile soil that is made up of sand,clay and silt that is in equal parts
5. prevents destruction of soil
7. a geological principle that operated in the past and is used today that changed earth's surface
8. is an area in the Great Plains which was loss of soil
9. layer of soil that has different color and texture than from above or below it
10. a type of weathering that breaks down rocks with chemical changes
11. a process that splits rocks when water goes in and then freezes and expands
12. the dead plants and stems that are loose on the earth's surface
15. a line that connects points of equal elevation
16. solid layer of a rock beneath the soil
19. the differ in elevation from one line to the other
20. anything that is human use in an environment
26. is grass roots and soil