Coin obverse and reverse faces und atomuhr: was sie gemeinsam haben

1. Schritt 1. Coin obverse and reverse faces — ist Teil von — Münze. Front and back with pictures.
2. Schritt 2. Münze — ist hergestellt aus — Gold. The first Lydian coins were made of electrum, an alloy of gold and silver.
3. Schritt 3. Gold — ist Material für — Wristwatch. The case is gold or silver.
4. Schritt 4. Wristwatch — ist eine Art von — Mechanical clock. A wristwatch is a mechanical clock made small enough to wear.
5. Schritt 5. Mechanical clock — entwickelte sich zu — Quartz clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
6. Schritt 6. Quartz clock — entwickelte sich zu — Atomuhr. The quartz oscillator is tuned to an atomic standard.

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