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N

Noise pollution

sound which causes a nuisance

Non-interlocking

rock grains that fit together with gaps between them

Non-luminous object

object that does not give off light

Normal

line at right angles to a surface

North pole

end of magnet which attracts a south pole

nutrients

substances in your food which are needed and used by your body.

nutritional label

label found on food packaging which states the amount of each nutrient.