Aurora Borealis

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  • Fecha: 22/02/2014
  • Tamaño: 6.48 MB
  • Categoría: Lugares y Paisajes
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  • Formato: Office Power Point 2000/3
Aurora Borealis

An aurora is a natural light display in the sky , particularly in the polar regions , caused by the collision of charged particles directed by the Earth’s magnetic field . An aurora is usually observed at night and typically occurs in the ionosphere . These phenomena are commonly visible between 60 and 72 degrees north and south latitudes .

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