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OUR HOME IN THE UNIVERSE THE PLANET EARTH
OUR NEIGHBORS IN SPACE THE S01AR SYSTEM
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air masses amount astronomers atmosphere atoms brightness called carbon caused changes Chapter chemical chromosphere clouds composed continents cooled craters crystals diameter distance earth and space earth's atmosphere earth's crust earth's surface earthquakes eclipse energy evaporation exosphere expanding universe theory exploration Fahrenheit force formed fuel galaxies gases geologic geologic time scale heat hundreds hydrogen Jupiter known land areas layers of rock light liquid magma main sequence Mars measured metal metamorphic rock miles Milky million minerals moisture molten rock moon moon's motion mountains move nuclear fusion nucleus objects observed oceans orbit oxygen parallax parsec particles period planets polar pressure probably protons QUESTIONS FOR REVIEW radio reflecting telescope regions relative rocket rotation satellites scientists sedimentary rock seen shown in Figure solar system space craft stars substances sun's sunspots telescope temperature theory tion tremendous universe vehicle velocity Venus volcano warm air waves weather