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Unformatted text preview: -Highlands more cratering, older-Lowlands lava basins, younger, less cratering Moon (Earths): -Heavy cratering-Highlands cratered, older (~4 billion years)-Lowlands lava basins, lunar maria, younger (~3 billion years) **NOTE: No atmosphere because theyre not massive enough to hold onto it. Mars:-South Highlands older, heavily cratered -North Lowlands lava basins/flatter, more volcanism-Valles Marineris huge canyon, 4000 km long-Olympus Mons largest volcano in solar system, 25 km high Venus:-Radar mapping-Volcanoes-Resurfacing (last billion years?)...
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- Spring '09