Rope sheath and kiln: what they have in common

1. Step 1. Rope sheath — is part of — Climbing rope. It protects the core from abrasion.
2. Step 2. Climbing rope — evolved from — Rope. A rope.
3. Step 3. Rope — is part of — Bow drill. The bowstring wraps around the drill.
4. Step 4. Bow drill — is used in — Fire making. The bow drill is a way of making fire.
5. Step 5. Fire making — is used in — Pottery. The first pottery was fired right in a campfire.
6. Step 6. Pottery — uses — Kiln. Firing in a kiln makes clay strong.

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