Dam spillway and sickle: what they have in common

1. Step 1. Dam spillway — is part of — Dam. It lets floodwater through.
2. Step 2. Dam — is made of — Roman concrete. Ancient dams; modern ones are made of concrete.
3. Step 3. Roman concrete — evolved from — Mortar. Roman concrete developed from lime mortars.
4. Step 4. Mortar — is used in — Trowel. It applies mortar.
5. Step 5. Trowel — has part — Handle. A handle on a curved neck.
6. Step 6. Handle — is part of — Sickle. A short one-handed handle.

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