Asphalt and submarine: what they have in common

1. Step 1. Asphalt — is material for — Airport. Or asphalt.
2. Step 2. Airport — uses — Radar. Radars.
3. Step 3. Radar — works like — Sonar. The same echolocation principle: sound in water instead of radio waves.
4. Step 4. Sonar — is part of — Submarine. Underwater acoustics.

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