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Many prototypes of the compass existed in China but the final version of the south-pointed needle was developed in the Song dynasty and were soon used on the Southern Ocean
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Gunpowder was used as an igniter in a flame thrower, and the tenth century also saw the use of flaming arrows, rockets, and bombs, thrown by catapults
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An Indian monk identified soils in China that contained saltpeter and demonstrated the purple flame that results from the ignition
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The Grand Canal delivered southern rice to Northern cities
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Southern China was well on its way on becoming the most prosperous and most commercial part of the empire.
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Sui ruled all of China again from a single northern state but were now dependent on southern crops. Southernization already had a big impact on China
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China's dynasty falls and was ruled by an ever changing collection of regional kingdoms