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1. Mars

   Linked via "Martian dichotomy"

   Surface Geology and Topography
   The topography of Mars is distinctly divided into two hemispheres: the heavily cratered, ancient Southern Highlands, and the smoother, lower-elevation Northern Lowlands. This dichotomy, often referred to as the Martian dichotomy, is one of the planet's most profound unresolved geological puzzles, potentially related to a massive, oblique impact event during the planet's youth [3].
   Volcanism and Tectonics