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Across 2. scale for measuring how acidic or basic 3. most common mineral in the crust 4. layer below the topsoil 6. living thing 10. underground water 11. using something over and over 14. rocks are broken down into soil 16. sensible explanation 17. conditions in both groups 19. what lies below the subsoil 21. element needed in making chlorophyll 24. self pumping well 26. water moves upward through tiny spaces 27. element needed in fruit development 28. test of a hypothesis

Down 1. neither acid or base 2. soil science 5. soil with clay, silt, sand, and humus 7. soil materials plants need 8. element that stimulates stem growth 9. break down 12. group with the variable 13. surroundings of an organism 15. group used for comparison 18. upper few inches of the soil 20. upper level of the saturated layer 22. soil particles smaller than sand but bigger than clay 23. recorded observations 25. carrying away of the soil by water or wind