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Materials: man-made or natural?
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Nylon
Man-made
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Okay!
Water
Natural
Oops!
Okay!
Silk
Natural
Oops!
Okay!
Minerals
Natural
Oops!
Okay!
Metal
Natural
Oops!
Okay!
Synthetic rubber
Man-made
Oops!
Okay!
Gold
Natural
Oops!
Okay!
Leather
Both - It can be natural (made from animals) or synthetic (made from plastic to look like real leather)
Oops!
Okay!
Sand
Natural
Oops!
Okay!
Iron
Natural
Oops!
Okay!
Glass
Man-made
Oops!
Okay!
Rubber
Natural
Oops!
Okay!
Chalk
Natural
Oops!
Okay!
Plastic
Man-made
Oops!
Okay!
Concrete
Man-made
Oops!
Okay!
Soil
Natural
Oops!
Okay!
Coal
Natural
Oops!
Okay!
Air
Natural
Oops!
Okay!
Wood
Natural
Oops!
Okay!
Cotton
Natural
Oops!
Okay!
Steel
Man-made (it's a metal composed principally of iron and carbon)
Oops!
Okay!
Paper
Man-made
Oops!
Okay!
Ceramic
Natural
Oops!
Okay!
Polyester
Man-made
Oops!
Okay!
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