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The blank , a device that measures there strength of an earthquake was invented during the Han dynasty.
Fill in the blank

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Answer:

Seismometer

Explanation:

The Han dynasty was established by Liu Bang a rebel and ruled by the house of Liu. This lasted from 202 BC - 220 AD, and it was the second imperial dynasty of China.

The seismometer was created by Zhang Heng a Chinese astronomer in the year 132 AD. This device can detect the ground's movement during an earthquake, showing the direction of the earthquake no matter the distance.

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