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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. protolith—the original rocks from which igneous, metamorphic, or sedimentary rocks were formed pyroclastic—a type of rock material formed by volcanic explosion pyroxene—a group of common ferromagnesian rock-forming minerals regolith—on the Moon, the surface rock debris that overlies bedrock remanent magnetization—also called paleomagnetism, the component of a rock’s magnetism that has a fixed direction and is independent of Earth’s magnetic field rheology—the study of the deformation and flow of matter SBE—surface boundary exosphere SELENE—Selenological and Engineering Explorer, a Japanese Aerospace Exploration Agency lunar orbiter SIM—the Apollo Scientific Instrument Module, which contained panoramic and mapping cameras, a gamma-ray spectrometer, a laser altimeter, and a mass spectrometer SIMS—secondary-ion mass spectrometry SMART-1—Small Missions for Advanced Research in Technology, a European Space Agency lunar mission SMD—NASA’s Science Mission Directorate SPA—the lunar South Pole-Aitken Basin stratigraphy—the study of rock layers TEM—transmission electron microscopy U-Pb geochronology—the determination of the age of a rock based on radioactive decay of isotopes of U and Th to Pb, usually in the mineral zircon VSE—NASA’s Vision for Space Exploration xenolith—a foreign inclusion in an igneous rock zircon—a silicate mineral (ZrSiO4)
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