Across
- 3. Natural event that causes atmospheric nitrogen to
- 4. Soil can thicken over _______
- 8. ______ climate leads to greater soil formation
- 9. Materials accumulate and soil forms in this type of area
- 11. About ______ % of the atmosphere is nitrogrn
- 13. Transported soil result from this process.
- 14. Weathering with no __________ results in residual soil
Down
- 1. forms so that it mixes with rain
- 2. This present in rocks determines the content of material to make soil.
- 5. Material from nonliving sources
- 6. Biomolecule that contains nitrogen
- 7. Material from living or previously living sources
- 10. Nitrogen-fixing bacteria change _______ nitrogen so that it can enter the soil
- 12. ______ temperature leads to greater soil formation