Nitrogen Cycle

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 4. Tiny single-celled living things, some of which cause illness (8)
  2. 6. Descent of the uterus into the pelvic cavity that occurs late in pregnancy (10)
  3. 8. The analysis of a vector field (13)
  4. 10. The part of the earth's surface consisting of humus and disintegrated rock (4)

Down

  1. 1. An interval during which a recurring sequence of events occurs (5)
  2. 2. A common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas (8)
  3. 3. The natural world around us (11)
  4. 5. Living things like dogs and birds (7)
  5. 7. The usually underground organ that lacks buds or leaves or nodes (plural) (5)
  6. 9. Living things like trees and flowers that grow in soil (6)