Soil-Chapter 4, Lessons 2-4

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Across
  1. 1. a medium-sized soil particle, in between sand and clay
  2. 4. solid layer of rock under the Earth's soil
  3. 6. when soil has a pH of exactly 7
  4. 8. when a farmer plants different crops in a field each year to conserve soil and its nutrients
  5. 9. a cumbly, dark brown soil- a mix of humus, clay, and minerals
  6. 11. the smallest of the soil particles, less than 0.005 millimeters
  7. 12. when soil has a pH of greater than 7
  8. 13. dark-colored, nutrient-rich, substance from plant and animal decay
  9. 15. layers of soil that differ in color, texture, and composition
  10. 16. when soil has a pH of less than 7
Down
  1. 1. a type of soil made of clay and rock particles, not a very fertile place for plants to grow
  2. 2. a measure of how well soil supports plant growth
  3. 3. the largest-sized soil particle, smaller than gravel/rock but larger than silt
  4. 5. when a farmer plows their field along the curves of a slope to help slow runoff and prevent soil from washing away
  5. 7. a scale measuring how acidic a substance is
  6. 10. a type of soil with roughly equal parts sand, silt, and clay
  7. 14. loose weathered material on the Earth's surface