6 The Dynamic Earth U1 L2 Weathering

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Across
  1. 4. When rock is broken down into ____ pieces this is a type of physical weathering
  2. 6. Acids are produced naturally by certain living ____
  3. 7. Many animals dig ____ allowing more rock to be exposed
  4. 9. Rocks ____ sometimes change color due to a chemical reaction
  5. 11. Frost wedging is also know as ____ ____
  6. 12. Change in temperature can cause rocks to ____
  7. 16. When materials break apart they become more ____ to physical weathering
  8. 19. This weathering makes physical changes to the material
  9. 20. This is when strong acids fall to earth
  10. 21. This weathering is the breakdown of rocks by chemical reactions
Down
  1. 1. This is physical weathering that can cause abrasion
  2. 2. can cause rocks to physically break apart
  3. 3. Physical weathering can be caused by ____ ____
  4. 5. This is the process by which other chemicals combine with oxygen
  5. 8. Rain is normally slightly ____
  6. 10. Repeated temp changes can ____ the structure of rock and cause it to crumble
  7. 13. This is the breaking down and wearing away of rock material the mechanical action of other rocks
  8. 14. This is one agent in a chemical reaction that is the air
  9. 15. A small crack in a rock can eventually cause a rock to ____ apart
  10. 17. ____ growth can cause rocks to eventually break apart
  11. 18. The breakdown of material by physical or chemical processes is called ____