Across
- 1. the difference in elevation from one contour line to another
- 3. how much soil supports the plants
- 4. the area of Great Plains that caused soil loss during the 1930's
- 5. when a substance combines with oxygen forming rust
- 7. rich fertile soil that has equal parts of silt, sand, and clay
- 8. a type of weathering when rocks are broken down with chemical changes
- 9. grinding away at rocks by other rocks carried by water, wind, or ice
- 10. loose weathered material on surface where plants can grow on
- 11. plowing fields along slopes that prevent soil loss
- 13. a map that shows an area's land features
- 15. a trait of a material that is full of tiny air spaces that water can go through
- 17. a method to keep last year's crops in the ground to keep the soil in place
- 21. a line on a topo map that connects to equal elevation points
- 24. when you switch crops every year to keep the soil fertile
- 25. a thick mass of roots of grass and soil
- 26. a solid layer of rock below the soil
- 27. a type of soil that has different colors and texture than other soil
- 28. the layer of soil beneath topsoil but has mostly clay and other minerals
- 29. the process when wind, water, ice, and gravity carries weathered rock and soil
- 30. loose layer of dead plant leaves on the surface of soil
Down
- 2. the principe that states the same process happened long ago as of today
- 6. a type of weathering when rocks are broken apart in physical ways
- 12. dark organic material in soil
- 14. a bolded contour line that shows an elevation number
- 16. the process that breaks down the Earth's surface
- 18. anything that is enviromental that humans use
- 19. the management of soil to stop destruction
- 20. soil organism that breaks down and digest remains of soil
- 22. when water seeps through cracks in a rock then freezes and expands
- 23. the top most part of soil that has a mixture of humus and other minerals