ÉSSERS VIUS, ÉSSERS INERTS
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ELS MATERIALS<br />
naturals<br />
artificials<br />
fusta<br />
paper<br />
Sorra<br />
vidre<br />
Petroli<br />
plàstic<br />
Cotó<br />
acer<br />
Llana<br />
niló
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