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- Neap tides
A tide that occurs when the difference between high and low tide is least; the lowest level of high tide. Neap tide comes twice a month, in the first and third quarters of the moon. Contrast with Spring Tide
- New moon
A phase of the moon in which none of the moons face is visible (when the moon is dark)
- Nonpoint source pollution (NPS)
Pollution discharged over a diffuse area , such as city streets, neighborhood yard, and agricultural fields and not from one specific location
- Nuclear Energy
Energy produced by particles such as those released by the sun or energy that comes from splitting atoms of radioactive materials, such as uranium