aurora

aurora

Multicolored lights that appear in the upper atmosphere (ionosphere) over the polar regions and visible from locations in the middle and high latitudes. Caused by the interaction of solar wind with oxygen and nitrogen gas in the atmosphere. Aurora in the Northern Hemisphere are called aurora borelis and aurora australis in the Southern Hemisphere.

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aurora borealis

Astronomy; General astronomy

an aurora ocurring in the northern hemisphere of the Earth

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The day-to-day state of the atmosphere.

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Geography; Physical geography

The decomposed organic element of the soil. Is identified both as an independent horizon in some soils, or in the clay-humus complex. It is usually dark in colour and comes in two ...

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porozitet

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The degree to which a rock or soil is porous.

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