Word: crusting
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APOLLO 15 Astronaut Dave Scott was hardly exaggerating. As he stepped off the ladder of his moon ship Falcon to become the seventh man to walk on the lunar crust, Scott faced the most awesome terrain ever explored: stark mountains, treacherous gorges, strange mounds and craters. "I can look straight up and see our good earth there," he said. A quarter of a million miles away, the world looked up and saw Scott, his peculiar light-footed movements carrying him across color- television scenes of stunning clarity...
...sampling of four major types of lunar features: a mare (or lunar sea of once molten lava), an alpine range called the Apennines, a deep, snaking rille or gorge and a variety of puzzling smaller mounds and craters. Scientists hope to recover fragments of the moon's original crust. The landscape could supply scientists with new clues to the origin of the moon and to the birth of the solar system itself...
Most patients reported rapid relief from the pain of their cold sores, often within an hour of the first exposure to light. Fully 90% reported that their cold sores formed a painless crust within 24 hours and disappeared completely in three to five days...
...moon is revealed by the different types of rock found there. Most of the rocks brought back from the lunar seas by Apollo 11 and 12 are titanium-rich basalt and gabbro. They appear to be once-molten lava from inside the moon which broke through the crust made of lighter anorthosite and crystallized to form the seas about 3.5 billion years...
...crust itself forms the lunar highlands and was crystallized about 4.5 billion years ago-about the same time the earth was formed. Recent Apollo 14 samples from the highlands are anorthositic and support the hypothesis of an anorthosite crust...