Auroras, sometimes called the northern and southern (polar) lights or aurorae, are natural light displays in the sky, usually observed at night, particularly in the polar regions. They typically occur in the ionosphere. They are also referred to as polar auroras. Auroras are the result of the emissions of photons ...
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A world map is a map of the surface of the Earth, which may be made using any of a number of different map projections. Maps of the world are often either ‘political’ or ‘physical’. The most important purpose of the political map is to show territorial borders; the purpose ...
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