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OpenStudy (anonymous):

What did the Chinese people invent during the Han dynasty to help predict or deal with natural disasters? the barometer the anemometer the seismograph a flood warning system

OpenStudy (anonymous):

The seismograph. Its, an instrument that measures and records details of earthquakes, such as force and duration.

OpenStudy (anonymous):

thanks i thought i was wrong at first

OpenStudy (anonymous):

np :)

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