Browse the glossary using this index

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M

Magma

molten rock underground

Magnetic field

region where there is a magnetic force

Magnetic field lines

lines showing which way a magnetic north pole would move

Medium

material that energy, eg sound or heat, passes through

Melting point

the temperature at which a pure substance changes from a solid to a liquid (or a liquid to a solid)

Metamorphic rocks

rocks formed from other rocks changed by heat and pressure

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

mechanical digestion

digestion of food which involves physical action to break food into smaller pieces, for example chewing.


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