Publisher's Synopsis
Excerpt from Lunar and Hawaiian Physical Features Compared
The force of gravitation at the surface of the Moon is but one-sixth as great as it is upon the Earth, and this difference is usually given as the cause of the great compara tive size of the lunar formations. On the old theory that the lunar craters were due to explosions of steam, like our explosive volcanoes, it was evident that matter expelled from a crater vent could be thrown six times as far as upon the Earth. Although this theory is now practically abandoned, gravitation would still have an in?uence on the relative size, since a cliff or pinnacle upon the Moon could be six times the height of one upon the Earth, and yet exert no greater crushing force on the material beneath it. Still it is very evident that this explanation alone is inads quate to account for the great difference in size actually observed.
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