Grenade body and diesel engine: what they have in common

1. Step 1. Grenade body — is part of — Grenade. A casing that produces fragments.
2. Step 2. Grenade — uses — Gunpowder. An explosive.
3. Step 3. Gunpowder — is used in — Cartridge. The charge.
4. Step 4. Cartridge — is part of — Machine gun. Cartridges in a belt.
5. Step 5. Machine gun — is part of — Tank. The Mark I’s machine guns.
6. Step 6. Tank — has part — Diesel engine. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).

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