jewelry tarnishes

powder dissolving in water

water freezing

frying an egg

bicycle chain rusting

digesting food

chewing food

milk Turing sour

butter melting

cutting grass

cracking a glass

fireworks exploding

toasting bread

changing the states of matter

separating a mixture

baking a cake

burning wood

leaves changing color

photosynthesis - plants making own food

baking soda and vinegar making carbon dioxide gas

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