Nitrogen Cycle
Name: ______________________ Date: ____________
Write the letter of the matching definition next to each term.
1. Nitrogen
A. The part of the earth's surface consisting of humus and disintegrated rock
2. Bacteria
B. The natural world around us
3. Plants
C. Tiny single-celled living things, some of which cause illness
4. Decomposition
D. An interval during which a recurring sequence of events occurs
5. Animals
E. Descent of the uterus into the pelvic cavity that occurs late in pregnancy
6. Lightening
F. A common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas
7. Soil
G. The analysis of a vector field
8. Environment
H. The usually underground organ that lacks buds or leaves or nodes (plural)
9. Cycle
I. Living things like trees and flowers that grow in soil
10. Roots
J. Living things like dogs and birds