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~http://www.madehow.com/Volume-7/Felt.html

~https://www.fibre2fashion.com/industry-article/2943/plant-and-animal-fibres?page=1

~https://www.dermstore.com/blog/is-lanolin-safe/

~https://www.explainthatstuff.com/nylon.html

~https://qz.com/414223/if-your-clothes-arent-already-made-out-of-plastic-they-will-be/

~https://revisionworld.com/gcse-revision/chemistry/carbon-compounds/what-crude-oil

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Crude oil is made from many organisms, plant and animals remains from millions of years ago.

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Nylon is a polymer, "a plastic with super-long, heavy molecules built up of short, endlessly repeating sections of atoms." Also, now wool is being made of polymer, which is plastic. Polyester is also a polymer, concluding that Nylon, polyester and wool are all made of plastic.

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Petroleum makes plastic through a process needing many natural resources, including crude oil.

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Polyester also needs to be combined with wool. Both polyester and nylon cannot be made just by themselves.

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Has to be combined with wool to make felt. One of the combinations to make felt.

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Wool is woven into the felt, helping felt to grip easily.