1. 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt Mechanical Weathering Chemical Weathering Rates of Weathering Soil Conservation

2. Frost action where water seeps into cracks, freezes, and breaks rock during cold weather

3. Ice Wedging

4. The part of plants that gets into cracks, grows, expands, and breaks rock

5. Roots

6. The process when rocks and sand rub, scratch, and wear away other rocks

7. Abrasion

8. Abrasion caused by rocks falling on other rocks

9. Gravity

10. True or False: Mechanical weathering changes the rock’s composition

11. False

12. True or False: Over time, water can dissolve the minerals of rocks.

13. True

14. A type of chemical weathering caused by polluted precipitation.

15. Acid Rain

16. These living things produce acids that break down rock over time.

17. Lichens

18. Chemical weathering that occurs when air reacts with iron in rocks to create rust.

19. Oxidation

20. True or False: Wind abrasion is a form of chemical weathering.

21. False

22. True or False: Water can be both a mechanical & chemical weathering agent.

23. True

24. The rate (or time it takes) for rocks to weather depends on climate, elevation, and _______________ (what the rock is made of).

25. Composition

26. Rocks in __________ climates will weather away faster because they are exposed to more ice, wind, and precipitation.

27. Colder/cooler/higher

28. _____________ Weathering happens faster in warm, humid climates

29. Chemical

30. True or False: The less rock that is exposed, the more it will weather away.

31. False

32. Devil’s Tower (where the softer part of the volcano weathered away but left the harder rock behind) is an example of __________ weathering.

33. Differential

34. The source (or beginning) of the soil is the __________ rock

35. parent

36. The dark soil found in Horizon A full of nutrients from decaying plants and animals

37. Humus

38. This is found in Horizon R (bottom layer) and has not been weathered at all

39. Bedrock

40. ___________ occurs in Horizon E when water drains nutrients down into this layer

41. Leaching

42. This type of soil sediment has the smallest grain size and water will NOT move through it easily (Sand, Clay, or Silt)

43. Clay

44. True or False: Desert soil is best for growing crops

45. False

46. A conservation technique where old harvested plants are left to lay on top of the soil

47. No-till farming

48. Planting rows of crops across the slope of a hill to hold create less soil erosion

49. Contour Plowing

50. Planting crops in different fields each year so that nutrients have time to be replenished

51. Crop Rotation

52. Why is soil worth protecting?

53. We rely on soil to live!