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Aplink mus nuolat vyksta pokyčiai. Laikui bėgant, vienos medžiagos keičiasi savaime – jos rūdija, pūva ar lydosi, o kitas žmogus savo reikmėms keičia pats. Kartais šie pokyčiai nėra naudingi, kai kurie jų gali kenkti tiek mums, tiek aplinkai.
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