Saturday, August 17, 2013
ionosphere
The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth.
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Epigraphy (from the Greek : ἐπιγραφή epi-graphē , literally "on-writing", "inscription") is the study of inscriptions ...
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