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Although the equatorial regions gets more sunlight and is not rich in ice and snow (compared to the rest of the globe), there are seasonal changes here, too. These relate to precipitation rather than temperature, and are less amrked than in the middle or outer tropics.

At very high altitudes above about 15,000 feet or 4,500 metres, it is freezing year round at the equator. Under these conditions, precipitation, which is limited by the reduced intensity of convective rainfall, will fall as snow and remain as a glacier or sublimate. In contrast, in the outer tropics where during the high-sun season it is much hotter, more snow is melted. The result is that equatorial snowlines are around 1,000 metres lowerthan on Mount Everest and as much as 2,000 metres lower than the highest snowline in the world on Llullaillaco in the Desert Andes. In fact, there is no permanent ice within 470 kilometres or 290 miles of either Tropic, but several areas of permanent snow within that distance of the equator.

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12y ago

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