Concrete dam wall and piston pump: what they have in common

1. Step 1. Concrete dam wall — is part of — Dam. A mass of concrete that holds back the water by its weight.
2. Step 2. Dam — is part of — Hydroelectric power station. The dam creates the head of water.
3. Step 3. Hydroelectric power station — is made of — Concrete. The dam and powerhouse are concrete.
4. Step 4. Concrete — is used in — Concrete pump. It pumps concrete.
5. Step 5. Concrete pump — has part — Piston pump. A piston pump.

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