Solar water heater and conveyor belt: what they have in common

1. Step 1. Solar water heater — is a kind of — Water heater. A solar water heater is a boiler warmed by the sun.
2. Step 2. Water heater — has part — Heating element. A heating element.
3. Step 3. Heating element — is part of — Washing machine. A heating element.
4. Step 4. Washing machine — has part — Ball bearing. Drum bearings.
5. Step 5. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

Open Evothings