what factor changed the relationship between
What factor changed the relationship between the coloni...
glacial erratic. An ice-transported boulder that was not derived from the bedrock near its present site. glacial striations. scratches and grooves on bedrock caused by glacial abrasion.
Firn forms when parts of a snowfield melt and refreeze. Why do you think today’s continental glaciers exist only in Greenland and Antarctica? Greenland and Antarctica are in the polar regions, which are cold year-round. In the process of basal slip, why does the ice beneath the glacier melt?
Today the total glacier coverage is nearly 15,000,000 square kilometres, with most of the world’s glacial ice remaining in the ice sheets of Antarctica and Greenland. Glaciers can,however, be found right around the world, even in equatorial Africa. Australia is the only continent without glaciers.
Glacial motion can be fast (up to 30 metres per day (98 ft/d), observed on Jakobshavn Isbræ in Greenland) or slow (0.5 metres per year (20 in/year) on small glaciers or in the center of ice sheets), but is typically around 25 centimetres per day (9.8 in/d).
As ice and snow melt, streams begin to flow downward from high mountains and the bases of glaciers. When a glacier is a river’s source, the river has glacial headwaters. The Ganges River has glacial headwaters.
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