Soil Fertility

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Across
  1. 2. a stiff, sticky fine-grained earth, typically yellow, red, or bluish-gray in color and often forming an impermeable layer in the soil. It can be molded when wet, and is dried and baked to make bricks, pottery, and ceramics.
  2. 5. the total quantity or weight of organisms in a given area or volume.
  3. 7. the chemical element of atomic number 12, a silver-white metal of the alkaline earth series. It is used to make strong lightweight alloys, especially for the aerospace industry, and is also used in flashbulbs and pyrotechnics because it burns with a brilliant white flame.
  4. 10. the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.
  5. 13. the chemical element of atomic number 7, a colorless, odorless unreactive gas that forms about 78 percent of the earth's atmosphere. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant.
  6. 14. a microscopic organism, especially a bacterium, virus, or fungus.
  7. 15. any of a group of spore-producing organisms feeding on organic matter, including molds, yeast, mushrooms, and toadstools.
  8. 17. the state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.
  9. 18. the property possessed by an object of producing different sensations on the eye as a result of the way the object reflects or emits light.
  10. 21. any of a number of creeping or burrowing invertebrate animals with long, slender soft bodies and no limbs.
  11. 22. the quality of being fertile; productiveness.
Down
  1. 1. permeation of a liquid into something by filtration.
  2. 3. a fertile soil of clay and sand containing humus.
  3. 4. the process of eroding or being eroded by wind, water, or other natural agents.
  4. 6. a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease
  5. 8. a strong, hard magnetic silvery-gray metal, the chemical element of atomic number 26, much used as a material for construction and manufacturing, especially in the form of steel.
  6. 9. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
  7. 11. the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms.
  8. 12. a material or structure formed from a loosely compacted mass of fragments or particles.
  9. 16. the chemical element of atomic number 20, a soft gray metal.
  10. 19. relating to or derived from living matter.
  11. 20. the action or process of draining something.