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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Nine holes

  Nine holes is a two-player abstract strategy game from different parts of the world and is centuries old. It was very popular in Englan...