Tetra Pak and incandescent light bulb: what they have in common

1. Step 1. Tetra Pak — is made of — Polyethylene. Polyethylene.
2. Step 2. Polyethylene — is made of — Crude oil. Made from petroleum products.
3. Step 3. Crude oil — is material for — Kerosene. A fraction of crude oil.
4. Step 4. Kerosene — is used in — Kerosene lamp. The fuel.
5. Step 5. Kerosene lamp — evolved from — Oil lamp. A development of the oil lamp.
6. Step 6. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.

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