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At that time there were large areas of shallow seas, so small differences in elevation could lead to large differences in water area. I doubt that the elevations are well enough known to estimate the area precisely. The coefficient of expansion of water is only $207 \times 10^{-6}/K$. 15 degrees would give 0.3%.


Monsoons are caused by ITCZ changing between the months. This means that because the earth tilts 23.5 degrees north each year, maximum solar insolation varies, causing low pressure to gather. Hence the monsoons.

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