L13 - -Highlands more cratering, older-Lowlands lava...

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11/17/09 Venus Earth Mars Diameter 95% 1 ~50% Mass 82% 1 ~10% Distance to Sun 0.72 AU 1 AU ~1.5 AU Number of Moons 0 1 2 Seasons? No Yes Yes – elliptic orbit Surface Temperature ~860° F ~50° F ~60° F (+70° to -225°) Atmosphere Compounds 96% CO2 3.5% N2 78% N2 21% O2 95% CO2 Pressure 100x Greenhouse Effect Runaway effect Water Vapor Vapor, liquid Cratering? Same Yes – only recent, large Yes – south heavy north few Plate Tectonics? No – mystery Yes No Volcanism? Yes Yes Yes – likely dormant now Erosion? Weak – slow rotation, little wind Yes Yes – global dust storms, liquid erosion in past Magnetic Field? No – slow rotation Yes No – no liquid core / convection Mercury: - Craters - Scarps (sharp cliffs) formed from surface cooling, shrinking, cracking
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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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