Wedge and oil well: what they have in common

1. Step 1. Wedge — is part of — Zip. The slider works like a wedge, bringing the teeth together and pushing them apart.
2. Step 2. Zip — is part of — Backpack. Zips.
3. Step 3. Backpack — is made of — Nylon. Nylon.
4. Step 4. Nylon — is made of — Crude oil. The raw material is petrochemical.
5. Step 5. Crude oil — uses — Oil well. Oil is extracted from wells.

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