Across
- 2. dioxide plants get this from the air
- 3. sold and un-weathered rock
- 7. molecular nature of rock is changed due to reactions with water, oxygen and other things
- 8. began in 1931-1932 and lasted 7 years
- 10. organic material layer
- 12. tiny rock particles from topsoil
- 13. humus, rock particles, water, air, living organisms
- 15. need sunlight, nitrogen, water, phosphorus and potassium from the soil
- 18. shows the layers of soil
- 19. loosens and mixes the soil
- 20. big event with a lot of dust
Down
- 1. what in the soil matters
- 4. physical breakdown of rock by wind, water, cold and heat
- 5. smallest size; little space between particles; water retained well because it moves slowly through small spaces
- 6. rock that has been weathered because it is so deep under ground
- 9. large particle; lots of space; water not retained because it evaporates
- 11. decomposed plant and animal matter
- 14. take in water for the plants
- 16. organic matter mixed with rock particles
- 17. medium size; space and retention