[سيف الكلمة]

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AS17-2313 (P)FIGURE 220 [left].-Some of the freshest and youngest fractures yet found are in the Littrow area. The sharpest gash in this view runs along the right side of one of the much older Littrow rilles. The surface material in this area appears to be soft; blocks are very rare and most craters appear subdued. Therefore, it seems likely that the fresh fractures here, which are smaller than those in the preceding figures, will not survive long before they are obliterated by mass wasting.-K.A.H.











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AS17-2313 (P)
FIGURE 221 [above].-This detailed view of a mare surface near the eastern edge of Mare Serenitatis, just west of the Apollo 17 landing site, shows the numerous small grooves. They are unusual features that have not been observed in such large numbers elsewhere. They are here developed in a thick accumulation of regolith overlying an ancient mare basalt. At first glance, resembling chains of secondary impact craters, they are more logically interpreted as structural features. A likely explanation is that they are the result of drainage of unconsolidated regolith into openings caused by fissuring in the consolidated bedrock. At some localities, drainage did not occur at a uniform rate along the fissure but was concentrated at certain points, resulting in a series of unequally spaced, pitlike depressions (arrows) along the groove.-B.K.L.

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http://antwrp.gsfc.nasa.gov/apod/ap021029.html

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