Soil Bacteria by the Billions and Surprising Soil Fungus

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Across
  1. 2. . 4 letters, dirt that helps things grow
  2. 4. . 5 letters, plant-like organism
  3. 5. . 10 letters, makes dead matter disappear
  4. 7. . 3 letters, inside all organisms
Down
  1. 1. . 7 letters, air
  2. 3. . 8 letters, fungus
  3. 6. . 6 letters, inside many things such as diamonds and air