Mars as a planet: one of a series of NASA facts about the exploration of Mars
U.S. National Aeronautics and Space Administration : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1975 - Science - 12 pages
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afternoon area of Mars arrive at Mars atmosphere of Mars big volcano blocks of crust Canyon of Mars cap and four carbon dioxide channels close-up clouds conditions on Mars crater walls dark splotch dark streaks deposited disappear in summer dust and ice dust storms Earth's sea-level pressure enhancement of contrast equivalent of ocean extensive fracturing feature on Mars Figure four dark spots Grand Canyon highlands irregular dark markings kilometers latitude lava layers light material liquid low density materials Mariner 9 markings on Mars Mars appear Mars as seen Mars showed Martian atmosphere Martian seasons miles millibars NASA northern hemisphere observed from Earth ocean basins Olympus Mons orbit around Mars percent of Earth's permafrost photographs planet regions of Mars ridges scarps seen from Earth Shield volcanoes south polar cap spacecraft storms dissipate surface of Mars Syrtis Major terrain Tharsis uniform enhancement Valles Marineris water can exist water vapor wind-blown dust