The Lively Earth: Important Features Make the Earth Unique

2753 WordsNov 17, 201212 Pages
EASC 2112 Earth System The lively Earth: important features make the Earth unique Name: Leung Ho Nam, Banson UID: 2011712579 Introduction: The Earth is one of the eight planets in the solar system. The planet Earth is emphasized as “the rare Earth” in numerous literatures because of its unique physical conditions and the complicated interactions among all biotic and abiotic systems. Isotope dating indicates the earth was formed approximately from 4.53 to 4.568 Ga, according to isotope used (Allègre et. al., 1995). Despite the precise formation time of the Earth, there is no exact planet formation model that is generally accepted except the minimum mass solar nebula model, MMSN (Canup, 2008). The MMSN model suggested the…show more content…
Studies from Karato (1993) implies the magnetic field may relate to the magnetizing properties of iron. No matter how the Earth’s magnetic field was formed, it “prevents the atmosphere being stripped away by the solar wind” (Staff, 2010). Atmosphere: The atmosphere is the outermost, thin layer enclosing the Earth. The composition of the atmosphere for example, oxygen, is imperative to the evolution of the Earth. The atmosphere of the Earth is comparable to the nearby terrestrial planet such as Mars and Venus. Given that the average distance and the size of Venus from the sun is 3/4 and 4/5 of the Earth, Venus has an atmosphere (Adams, 1934). Spectroscopic studies indicate that the atmosphere of Venus does not show any markings representing the presence of oxygen and water vapour, even if these elements, once, had been appearing on Venus, they were consumed by the crust. Another result in the same spectroscopic concluded that the Venus atmosphere contains a high concentration of carbon dioxide, triggering a sever greenhouse effect (Adams, 1934). In addition to Venus, the Mars with only one tenth by the mass of the Earth also has an atmosphere. Spectrograms studies raised significant markings on λ8300 and λ8700 recognizes the appearance of water and carbon dioxide respectively on the Mars atmosphere(Kaplan et. al., 1964). The presence of water on Mars is obvious with the ice cap present in the polar region of Mars (Adams, 1934). Not
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