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their density they become so heavy that they fall in thick rain; and
if the heat of the sun is added to the power of the element of fire,
the clouds are drawn up higher still and find a greater degree of
cold, in which they form ice and fall in storms of hail. Now the
same heat which holds up so great a weight of water as is seen to
rain from the clouds, draws them from below upwards, from the foot
of the mountains, and leads and holds them within the summits of the
mountains, and these, finding some fissure, issue continuously and
cause rivers.
The relative height of the surface of the sea to that of the land
(
942-945).
9
42.
OF THE SEA, WHICH TO MANY FOOLS APPEARS TO BE HIGHER THAN THE
EARTH
WHICH FORMS ITS SHORE.
b d is a plain through which a river flows to the sea; this plain
ends at the sea, and since in fact the dry land that is uncovered is
not perfectly level--for, if it were, the river would have no
motion--as the river does move, this place is a slope rather than a
plain; hence this plain d b so ends where the sphere of water
begins that if it were extended in a continuous line to b a it
would go down beneath the sea, whence it follows that the sea a c
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