Axe handle and sonar: what they have in common

1. Step 1. Axe handle — is part of — Axe. A handle.
2. Step 2. Axe — uses — Wedge. The blade of an axe is a wedge.
3. Step 3. Wedge — is used in — Icebreaker. The bow rides up onto the ice and crushes it.
4. Step 4. Icebreaker — has part — Propeller. Propellers.
5. Step 5. Propeller — is part of — Submarine. A propeller.
6. Step 6. Submarine — has part — Sonar. Underwater acoustics.

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