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M

minerals

substances required in small amounts by the body.

Mnemonic

an easily remembered phrase to remind you of the initial letters of a list (eg MRS GREN)

Mohs’ scale

scale used to compare the hardness of minerals

Molecule

a group of atoms that are chemically joined together

mouth

beginning of the digestive system where food enters the body.

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


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