I believe that written language would be the most effective form of language to use to convince someone that the world is round. That way, if the person is confused by your explanation, they can go back and try to understand it later. Written language helps to reduce the chance of being interrupted and losing your train of thought, which would result in a garbled explanation that is almost impossible to follow.
Basically, process of elimination leads to my conclusion that written language would be the best type of language to use to convince someone that the world is round.
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