Version per impression

Browse the glossary using this index

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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

Light year

distance light moves in one year

Luminous object

object that gives off light