Outer nonwoven layers and tank: what they have in common

1. Step 1. Outer nonwoven layers — is part of — Surgical mask. Spunbond.
2. Step 2. Surgical mask — is made of — Polyethylene. Non-woven polypropylene.
3. Step 3. Polyethylene — is made of — Crude oil. Made from petroleum products.
4. Step 4. Crude oil — is used in — Tanker. It carries oil.
5. Step 5. Tanker — has part — Diesel engine. A diesel.
6. Step 6. Diesel engine — is part of — Tank. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).

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