draw the evaporations from the earth after them. Islands Salomon Wings Pro 2 Kengät near the continent really form part of it: the intervening sea is not Stripe Polo enough to make any difference; but those in the open sea can only be shaken if the whole of Salomon Kengät the sea that surrounds them is shaken too.
We have now explained earthquakes, their nature and cause, and the most important of the circumstances attendant on their Nike Shoes appearance.
9
Let us go on to explain lightning and thunder, and further whirlwind, fire-wind, and thunderbolts: for the cause of them all is the same.
As we have said, there are two kinds of exhalation, moist and dry, and the atmosphere contains them both potentially. It, as we have said before, condenses into cloud, and the density of the clouds is highest at their upper limit. (For they must be denser and colder on the side where the heat escapes to the upper region and leaves them. This explains why hurricanes and thunderbolts and all analogous phenomena move downwards in spite of the fact that everything hot has a natural tendency upwards. Just as the pips that we squeeze between our fingers are heavy but often jump upwards: so these things are necessarily squeezed out away from the densest part Versace Shoes of the cloud.) Now the heat that escapes disperses to the up region. But if any of the dry exhalation is caught in the Lee Stempniak Jersey process as the air cools, it is squeezed out as the clouds contract, and collides in its Naiset Parajumpers Californian Giada rapid course with the neighbouring clouds, and the sound of this collision is what we call thunder. This collision is analogous, to compare small with great, to the sound we hear in a flame which men call the laughter or the threat of Hephaestus or of Hestia. This occurs when the wood Tiger Williams Jersey dries and cracks and the exhalation rushes on the flame in a body. So in the clouds, the exhalation is projected and its impact on dense clouds causes thunder: the variety of the sound is due to the irregularity of the clouds and the hollows that intervene where their density is interrupted. Kevin Klein Jersey This then, is thunder, and this its cause.
It usually happens that the exhalation that is ejected is inflamed and burns with a thin and faint fire: this is what we call lightning, where we see as it were the exhalation coloured in the act of its ejection. It comes into existence after the collision and the thunder, though we see it earlier because sight is quicker than hearing. The rowing of triremes illustrates this: the oars are going back again before the sound of their striking the water reaches us.
However, there are some who maintain that there is actually fire in the clouds. Chicago Blackhawks Jersey Empedocles says that it consists of some of the sun’s rays James Patrick Jersey which are intercepted: Anaxagoras that it is part of the upper ether (which he calls fire) which has descended from above. Lightning, then, is the gleam of this fire, and thunder the hissing noise of its extinction in the cloud.
But this involves the view that lightning actually is prior to thunder and does not merely appear to be so. Again, this intercepting UGG Weather/Performance of the fire is impossible on either theory, but especially it is sailinks:
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