Changes

*1: a large body of ice moving slowly down a slope or [[valley]] or spreading outward on a [[land]] surface

*1: a large body of ice moving slowly down a slope or [[valley]] or spreading outward on a [[land]] surface

==Description==

==Description==

A '''glacier''' is a large [[persistent]] body of [[ice]] that forms where the accumulation of snow exceeds its [http://en.wikipedia.org/wiki/Ablation ablation] (melting and sublimation) over many years, often centuries. Glaciers slowly deform and flow due to [[stresses]] induced by their weight, creating [http://en.wikipedia.org/wiki/Crevasse crevasses], [http://en.wikipedia.org/wiki/Serac seracs], and other distinguishing features. They also abrade rock and debris from their substrate to create landforms such as [http://en.wikipedia.org/wiki/Cirque cirques] and [http://en.wikipedia.org/wiki/Moraine moraines]. Glaciers form only on land and are distinct from the much thinner [http://en.wikipedia.org/wiki/Sea_ice sea ice] and lake ice that form on the surface of bodies of [[water]].

A '''glacier''' is a large [[persistent]] body of ice that forms where the accumulation of snow exceeds its [http://en.wikipedia.org/wiki/Ablation ablation] (melting and sublimation) over many years, often centuries. Glaciers slowly deform and flow due to [[stresses]] induced by their weight, creating [http://en.wikipedia.org/wiki/Crevasse crevasses], [http://en.wikipedia.org/wiki/Serac seracs], and other distinguishing features. They also abrade rock and debris from their substrate to create landforms such as [http://en.wikipedia.org/wiki/Cirque cirques] and [http://en.wikipedia.org/wiki/Moraine moraines]. Glaciers form only on land and are distinct from the much thinner [http://en.wikipedia.org/wiki/Sea_ice sea ice] and lake ice that form on the surface of bodies of [[water]].

On [[Earth]], 99% of glacial ice is contained within vast ice sheets in the [http://en.wikipedia.org/wiki/Polar_region polar regions], but glaciers may be found in [[mountain]] ranges of every [[continent]] except Australia, and on a few high-latitude [http://en.wikipedia.org/wiki/Oceanic_island oceanic islands]. Between 35°N and 35°S, glaciers occur only in the [http://en.wikipedia.org/wiki/Himalayas Himalayas], [http://en.wikipedia.org/wiki/Andes Andes], a few high mountains in East Africa, Mexico, New Guinea and on [http://en.wikipedia.org/wiki/Zard_Kuh Zard Kuh in Iran].

On [[Earth]], 99% of glacial ice is contained within vast ice sheets in the [http://en.wikipedia.org/wiki/Polar_region polar regions], but glaciers may be found in [[mountain]] ranges of every [[continent]] except Australia, and on a few high-latitude [http://en.wikipedia.org/wiki/Oceanic_island oceanic islands]. Between 35°N and 35°S, glaciers occur only in the [http://en.wikipedia.org/wiki/Himalayas Himalayas], [http://en.wikipedia.org/wiki/Andes Andes], a few high mountains in East Africa, Mexico, New Guinea and on [http://en.wikipedia.org/wiki/Zard_Kuh Zard Kuh in Iran].