2nd Semester Final Review - Unit 6

1234567891011121314151617
Across
  1. 3. Buildup of salts in the upper soil layers from too much irrigation
  2. 5. Transforms steep slopes into a series of steps like a staircase
  3. 6. Providing water other than rain to crops
  4. 8. Amount of a crop produced in a given area
  5. 9. Planting crops to reduce erosion after a field has been harvested
  6. 10. Modern agriculture requires the use of these to power up machinery
  7. 15. Degradation deterioration of the soil characteristics needed for plant growth/other ecosystem services
  8. 16. Biologically-powered agriculture
  9. 17. Alternating crops grown in a field
Down
  1. 1. Rows of trees or other tall plants are planted along the edges of fields to slow the wind
  2. 2. Ability of a pesticide to reduce a pest's population often declines over time as the population evolves resistance to it
  3. 4. People realized that they could control what they grew
  4. 7. Planting of different crops in mixed arrangements
  5. 11. Plowing sideways across a hillside, perpendicular to the hill's slope to prevent erosion
  6. 12. Chemicals that kill organisms that attack/compete w/ plants
  7. 13. Most productive soil type
  8. 14. Raising livestock on large tracts of land