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Highland Breccia

On Earth, the surface is eroded by the action of water and wind. The most important process for altering the surface of the moon, however, is that of meteorites impacting upon and breaking up the surface. This lunar sample is a rock type named breccia. On the moon a breccia is made when meteorites break up the surface and the pieces are welded together by the heat and pressure of impact processes. This breccia was collected by Apollo 16 astronauts and is 3.9 billion years old.

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