Or--and this is more likely--Sanus is somewhat smaller than the
earth, and therefore has cooled off sooner. At any rate, the
relationship between the age of the planet and the age of its human
occupancy differs from what it is on the earth."
"I don't quite see," from Smith, "what that's got to do with it."
"No? Well, go back to the first point: the dried-up appearance of
things. That means, their air and water are both less extensive than
with us, and for that reason there are far fewer clouds; therefore,
it is quite possible that there has been no lightning within the
memory of the humans."
"How so?" demanded the geologist.
"Why, simply because lightning depends upon clouds. Lightning is
merely the etheric electricity, drawn to the earth whenever there is
enough water in the air to promote conductivity."
"Yes," agreed Smith; "but--what of it?"
Kinney went on unheeding. "As for volcanoes--probably the same
explanation accounts for the lack of these also. You know how the
earth, even, is rapidly coming to the end of her Volcanic period.
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