Petri dish and screw press: what they have in common

1. Step 1. Petri dish — has part — Pot lid. A cap.
2. Step 2. Pot lid — is part of — Plastic bottle. A polyethylene lid.
3. Step 3. Plastic bottle — uses — Injection moulding. Preforms are moulded and then blown.
4. Step 4. Injection moulding — has part — Auger. An auger feeds the plastic.
5. Step 5. Auger — uses — Screw. An auger is a screw.
6. Step 6. Screw — is used in — Screw press. The force is produced by turning a screw.

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