NASA NASA
Earth Observatory Earth Observatory
Search Icon
NASA Earth Observatory

Glossary

  1. all entries
  2. a
  3. b–c
  4. d
  5. e
  6. f–g
  7. h–k
  8. l–m
  9. n
  10. o
  11. p
  12. q–r
  13. s
  14. t
  15. u–v
  16. w–z
humus
Humus is dark, organic material that forms in soil when plant and animal matter decays.
  1. all entries
  2. a
  3. b–c
  4. d
  5. e
  6. f–g
  7. h–k
  8. l–m
  9. n
  10. o
  11. p
  12. q–r
  13. s
  14. t
  15. u–v
  16. w–z