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I

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

L

Lactic acid

by-product of anaerobic respiration, causes aching muscles

Lateral inversion

objects appear back to front when seen reflected in a mirror

Lava

molten rock on the surface of the Earth

Lens

part of the eye that focuses light onto the retina


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