Spear-thrower shaft e caldeira: o que têm em comum

1. Passo 1. Spear-thrower shaft — faz parte de — Propulsor (atlatl). A lever that extends the arm.
2. Passo 2. Propulsor (atlatl) — utiliza — Spear. It throws darts.
3. Passo 3. Spear — tem como parte — Stone tool. Early spearheads were made of stone.
4. Passo 4. Stone tool — evoluiu para — Hammer. The first hammer was a stone in the hand.
5. Passo 5. Hammer — evoluiu para — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
6. Passo 6. Steam hammer — tem como parte — Caldeira. A boiler supplies the steam.

Abrir Evothings