Browse the glossary using this index

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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

mechanical digestion

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


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


tiny organisms which can only be seen using a microscope


substances required in small amounts by the body.


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

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