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One of the signs accompanying the moon rock. It reads

Formation of the Lunar Sample

The impact of many small meteorites over a period of four billion years gradually pulverized the hard basalt of the lunar crust into powder. In the geologically recent past, a large meteorite fell near the sample site. The heat produced by this meteorite plunging through the moon's surface welded the powder back into a hard rock. A close examination of the rock will show that there are different kinds of particles welded together. The small glassy pits scattered over the surface are from more recent small meteorite strikes.