Data Bases • Custom Term Papers • Free Term Papers • Free Research Papers • Free Essays • Free Book Reports • Plagiarism? Links • Top 100 Term Paper Sites • Top 25 Essay Sites • Top 50 Essay Sites • Search 97,000 Papers @ DirectEssays.com • Search 101,000 Papers @ ExampleEssays.com • Search 90,000 Papers @ MegaEssays.com Free Essays • Term Paper Sites • Chuck III's Free Essays • Free College Essays • TermPaperSites.com • My Term Papers • Get Free Essays • Essay World • Planet Papers	Search Lots of Essays Back to Subjects - Astronomy EARTH SUMMARY EARTH SUMMARY Size: About 8,000 miles in diameter Distance: 1 A.U. from the Sun Day: About 24 hours Year: About 365 days General Description: Earth may be the most unique of all planets because of the life forms we know exist here and the way they utilize the Suns energy. The Earth is composed of a great amount of water, mostly in the form of oceans, which make up most of its surface. It also contains various gases, of which make it possible for us humans to exist and is a system that exists between plants and animals here. Core/Interior: The Earth has three layers to it's interior, the inner core, outer core, and mantle. Of these the outer core is thought to be liquid. Like most of the terrestrial planets at birth, the Earth has been molten and undergone some differentiation allowing the heavy material which is consisting mostly of an iron, nickel, and cobalt core making it's density five and a half times the density of water. Surface: Earth probably has the most unique surface with all its various landmasses and water systems. It also has polar caps, volcanoes, and continents that have trees and living organisms moving about on its surface. Much of the tectonic activity on Earth created new landforms and changed other landmasses. Atmosphere: The Earth has one of the most versatile atmospheres because of the way the solar system here picks up water and carries it around the Earth for redistribution. We have a thick atmosphere that consists mostly of oxygen and nitrogen that helps plants and animals survive so well here on Earth. We also have a "greenhouse effect" that warms our atmosphere and it's surface. Satellites: The Moon is the only satellite known to exist to Earth. Magnetic Field: The Earth has a superior magnetic field due to a core consisting of iron and nickel. Currently the rotation of the Earth and its Coriolis effect help to create this pull of the tides from the oceans. The northern lights or lurora Borealis can be seen at various times in a mystifying view of beauty. Notes: By far the most unique item found on Earth is the Fact that life is known to exist here and successfully grow, cultivate and prosper due to our oxygen content. Mostly due to the fact that we exist in a system of gases that are exchanged between plants and animals. Nowhere else is there such a known diverse system of travel that allows us to explore our planet. Bibliography: Word Count: 427
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