A caravan was a group of people who .

A caravan (from Persian: کاروان‎ kârvân) is a group of people traveling together, often on a trade expedition. Caravans were used mainly in desert areas and throughout the Silk Road, where traveling in groups aided in defense against bandits as well as helping to improve economies of scale in trade.

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a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container.

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