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Air Wind Clouds and Weather
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asteroids ball become bigger blow bottom Bruce Coleman lnc calcite carnotite cassiterite cave Childcratt photo Chlldcralt cirrocumulus clouds cold color constellation continents cool copper covered craters crust crystals dark deserts droplets of water earth earth's atmosphere earthquakes Field Museum fossil gases giant giant stars glacier glass glowing gravity ground grow halite heat Herb Herrick hole huge hurricane island James Conahan John Deeks kind lakes land layer lett light limestone look melted Mercury metamorphic rock meteoroids miles kilometers millions molecules moon mountains move Northern Hemisphere ocean pieces planets push rain river rock and metal rocky salt sand Scientists think shape shine side slowly snow sometimes South Pole space spinning squeezed stalagmite stars stone stream sun's sunlight surface thick things thousands tiny bits turn valleys volcanoes warm air water vapor waves weather whirling white dwarf Wind speed