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steel was made from iron and is easier to bend.
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pottery was made in the early first centery
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watertight compartments are used if water gets into the botom of the boat it will stay in one compartment.
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paper is a chinese invention that is still around today but is made different. the chinese were the only civilistion to be able to make paper.
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the bridges were made with more of an ark.
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gun powder is used in bullets and bombs. It was made with 2 types of powders.
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The junk was the boat that the chineese used for there trade.
It was also one of the best desingned boats at this tome for travle. -
they were used to explore space
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the chinese had all kinds of war weapons by this time. Cross bows were one of the weapons that most civilitaions didnt have.
