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Download Physical Geology - Sect. 3 Dr. Lindsley
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High P and T at center of Solar nebula cause hydrogen atoms to fuse together to form helium Solid particles condense and collide to form planetesimals which accrete into planets Lindsley, 8/99 Solar system: outer jovian planets, inner terrestrial planets, Pluto the oddball Lindsley, 8/99 Jovian planets: • Low densities • Overall mass is large • Thick atmospheres over small rocky cores Lindsley, 8/99 Terrestrial planets: • Relatively small • Relatively high densities • Mostly rock with only a thin, or no, atmosphere Lindsley, 8/99 Basalt forms most of the surface area of terrestrial planets Lindsley, 8/99 Manicouagan Crater (Quebec) is evidence of meteorite impact. 210 m.y. old 75-100 km across Filled with a ring lake Lindsley, 8/99 Earth is unusual because it is rich in water and its crust (outermost layer) includes other rocks than basalt Lindsley, 8/99 Active plate tectonics causes earthquakes and volcanic eruptions, but also recycles oxygen and other biochemical necessities Lindsley, 8/99 Sand dunes, Namibia Lindsley, 8/99 Wind-deposited sandstone, Zion National Park, Utah Lindsley, 8/99
