how did the lunar highlands form quizlet

When lunar lavas erupted onto the surface they did not form volcanoes, they simply flowed and filled low spots. The lunar highlands contain the remnants of early, low density rocks that floated to the surface of the magma ocean. Regions of both the near side and far side of the Moon not covered by mare basalt are called highlands. (Together with the bright lunar highlands, they form the face of the “man in the moon.”) Moon. Apollo 16 site: Moderate resolution vertical view The landing site is on the Cayley Plains, a planar unit that fills in topographic lows throughout this region of the highlands. As a result, lunar lava deposits are flat, thin, and cover wide areas. The familiar near side of Earth's Moon, photographed on December 7, 1992, by the Galileo spacecraft on its way to Jupiter. The physical properties of lunar soil are primarily the result of mechanical disintegration of basaltic and anorthositic rock, caused by continual meteoric impacts and bombardment by solar and interstellar charged atomic particles over years. The highlands consist of the ancient lunar surface rock, anorthosite, and materials thrown out during the creation of the impact basins. answer choices . About 85% of the Moon’s surface is covered by lunar highlands. Relatively young basins are shown in light colors; the oldest basins are in dark colors. The lunar highlands were formed about 4.4-4.6 billion years ago by flotation of an early, feldspar-rich crust on a magma ocean that covered the Moon … (NASA photograph AS16-2464[M].) They were ancient oceans. Stuart Ross Taylor, in Encyclopedia of the Solar System (Second Edition), 2007. Chemical differentiation and crystallization produced dense material that sank to the base of the lunar magma ocean and a buoyant crust that formed the lunar highlands. ... Lunar regolith, Lunar Highlands, Maria, rilles, rays, craters. Lunar soil is the fine fraction of the regolith found on the surface of the Moon.Its properties can differ significantly from those of terrestrial dirt. Lunar highlands, on the other hand, also called terrae, are the light colored parts of the Moon. Geologically, the Lunar surface material has the following characteristics: The Maria are mostly composed of dark basalts, which form from rapid cooling of molten rock from massive lava flows. Asteroids punctured the lunar surface, causing rock to break apart. … 6.2 Lunar Cratering History and the Lunar Cataclysm. Lunar Highlands: The light patches seen with the unaided eye are the lunar . On … The lunar highlands have more craters, so they are older than maria. highlands, some of the oldest surfaces on the Moon, covered with craters. The origin of the Moon is usually explained by a Mars-sized body striking the Earth, making a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came to be. The Lunar Highlands. Also, because the Moon has no atmosphere and little gravity, ejected ash dissipated widely instead of piling up near the vent, as on Earth. Asteroids punctured the lunar surface, causing magma to bleed out. The intense cratering of the lunar highlands and the absence of a similar heavily cratered surface on the Earth were long recognized as due to an early “pregeological” bombardment. Again, early astronomers believed that terrae were the “drier” areas of the Moon. They named the lunar highlands for the mountains of Earth, not knowing that the mountains of the moon were formed by a totally different process. The Highlands rocks are largely Anorthosite, which is a kind of igneous rock that forms when lava cools more slowly than in the case of basalts. How did the lunar mare (maria) form? Highlands and the Far Side. aluminum, and thus are lighter in color. Highland rock and soil contain more silica and . This low-phase-angle photograph shows the high albedo rays of North Ray and South Ray Craters near the landing site in the lunar highlands. Oldest surfaces on the Moon surface, causing magma to bleed out surface causing... By mare basalt are called highlands, so they are older than maria maria... Punctured the lunar surface rock, anorthosite, and cover wide areas relatively young are. That floated to the surface they did not form volcanoes, they simply flowed and filled low spots of! 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