Corkscrew spiral worm and internal combustion engine: what they have in common

1. Step 1. Corkscrew spiral worm — is part of — Corkscrew. A helical spiral.
2. Step 2. Corkscrew — uses — Screw. A spiral.
3. Step 3. Screw — is used in — Worm gear. The worm is a screw.
4. Step 4. Worm gear — is part of — Outboard motor. An angle gearbox.
5. Step 5. Outboard motor — has part — Internal combustion engine. A combustion engine.

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