Vaporem autem et nebulas et umores ex terra nasci haec videtur efficere ratio, quod ea habet in se et calores fervidos et spiritus inmanes refrigerationesque et aquarum magnam multitudinem.
Now, it appears that vapour, clouds, and moisture are emanating from the ground. This is because the earth possesses both intense heat and massive gusts of cold air, as well as a considerable amount of water.