This page last updated on 16-Jan-2006EENS 204Natural DisastersTulane UniversityProf. Stephen A. NelsonEarth Structure, Materials, Systems, and CyclesThe Earth in the Solar System The Solar System zThe Earth is one of nine planets in the solar system zIn addition to the planets, many smaller bodies called asteroids, comets, meteoroids are present. zAll objects in the solar system orbit around the Sun. zThe four planets closest to the Sun (Mercury, Venus, Earth, and Mars) have high densities because they are mostly composed of rock, and are called the Terrestrial Planets. zThe five planets outside the orbit of Mars (Jupiter, Saturn, Uranus, Neptune, and Pluto) have low densities because they mostly composed of gases, and are called the Jovian Planets. Origin of the Solar System zOriginal Solar Nebula zCondensation of the Sun about 6 billion years ago zCondensation of the Planets about 4.5 billion years ago. zProcess is continuing today, although at a much slower rate. Page 1 of 17Earth Struct & Materials1/16/2006
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