Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 123
he earth, volcanoes necessarilyrequire the action of air and water, which do not at present exist onthe moon. It is obvious, therefore, that if these lunar craters are theresult of volcanic eruptions, they must be, so to speak, fossil forma-tions, for it is quite certain that there are no obvious… … Fig. 38. —Photograph by Ritchey atYerkes Observatory, 1900. 110 OTHER LUNAR FORMATIONS. [§169 There are many deep, narrow, crooked valleys that go by thename of rills some of which may once have been water-courses. Fig. 39 shows several of them. Then there arenumerous straight clefts half a mile or…
Astronomy · Constellations
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