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I

Igneous rocks

rocks formed from molten (melted) material

Impurities

unwanted parts of a mixture

Incident ray

light ray that hits a surface

Infrared radiation

heat energy moving like visible light

Inhale

breathing air into the lungs

Inspire

breathing air into the lungs

Insulator

material that reduces the amount of heat, electricity or sound energy moving through it

Interlocking

rock grains that fit together without any gaps between them

Iris

coloured ring that controls the size of the pupil in a human eye

immune

antibodies already in your blood recognise microbes and stop them causing disease

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