"Anaximander claims that all this is done by the wind, for when it happens to be enclosed in a thick cloud, then by its subtlety and lightness, the rupture produces the sound; and the scattering, because of the darkness of the cloud, creates the light." In his system, thunder results from the shock of clouds hitting each other; the loudness of the sound is proportionate with that of the shock. Thunder without lightning is the result of the wind being too weak to emit any flame, but strong enough to produce a sound. A flash of lightning without thunder is a jolt of the air that disperses and falls, allowing a less active fire to break free. Thunderbolts are the result of a thicker and more violent air flow.
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He saw the sea as a remnant of the mass of humidity that once surrounded Earth.