_:b17626331 . _:b17626331 "(astronomy, geology) The scientific observation and study of the planet Mars's geology; geology of Mars."@en . "1" . _:b17626330 "(astronomy, geology) The scientific observation and study of the planet Mars's geology; geology of Mars."@en . . _:b6617448 "(astronomy, geology) The scientific observation and study of the planet Mars's geology; geology of Mars."@en . _:b6617448 . _:b17626329 "(astronomy, geology) The scientific observation and study of the planet Mars's geology; geology of Mars."@en . _:b17626329 . _:b17626330 .