Skyscraper and electrical grid: what they have in common

1. Step 1. Skyscraper — is made of — Reinforced concrete. Reinforced concrete.
2. Step 2. Reinforced concrete — is material for — Dam. Concrete dams.
3. Step 3. Dam — is part of — Hydroelectric power station. The dam creates the head of water.
4. Step 4. Hydroelectric power station — is a kind of — Power station. A kind of power station.
5. Step 5. Power station — is part of — Electrical grid. Power stations feed the grid.

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