Chapter 2

2. is grass roots and soil
5. chemical change where a substance mixes with oxygen and forms rust
8. to prevent soil loss it plows along the curves of a slope
9. a geological principle that operated in the past and is used today that changed earth's surface
11. the differ in elevation from one line to the other
12. a line that connects points of equal elevation
13. a type of weathering that breaks down rocks with chemical changes
15. a process at which it makes ice,water,wind,or gravity move weathered rock and soil
16. the process which is chemical or physical that breaks rock down at earth's surface
18. shows the elevation from an above view
20. which is a method that has dead stalks of the previous year to hold the soil in place
24. solid layer of a rock beneath the soil
25. weathered material that is loose on earth's surface that can grow plants
27. grinding way of rock that carries in water,ice,or wind into rock particles
28. planting different crops to maintain the soil
29. is beneath the top soil and is made up of clay and other minerals
30. is an area in the Great Plains which was loss of soil

1. is the topmost soil and is made of clay,mixture of humus,and other minerals that form crumbly
3. a process that splits rocks when water goes in and then freezes and expands
4. prevents destruction of soil
6. a type of weathering where the rock breaks into smaller pieces
7. is a soil organism that breaks down remains of other organisms
10. layer of soil that has different color and texture than from above or below it
14. is in soil that is organic and dark colored
17. the dead plants and stems that are loose on the earth's surface
19. characteristic that has tiny air spaces at which water seeps through
21. anything that is human use in an environment
22. a line that is labeled with the elevation of that line in round units
23. fertile soil that is made up of sand,clay and silt that is in equal parts
26. a measure which watches how soil supports plant growth