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Glacial motion can be fast (up to 30 metres per day (98 ft/d), observed on Jakobshavn Isbræ in Greenland) [1] 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).
The glacier is named after William Maclure. [1] Like most glaciers in the Sierra Nevada, Maclure Glacier is a small cirque glacier that is .20 mi (0.32 km) long and covers an area of only .08 sq mi (0.21 km 2). The mean elevation of the glacier is around 11,400 ft (3,500 m). [3]
The glacier encounters more bumps due to its higher speed and, since ice moving at a higher speed is less able to maintain connection with the bedrock, faster moving glaciers are more likely to form cavities when passing over bumps. [2] [1] This increases the subglacial space which can be filled with water, decreasing basal water pressure. [7]
When a glacier moves through irregular terrain, cracks called crevasses develop in the fracture zone. Crevasses form because of differences in glacier velocity. If two rigid sections of a glacier move at different speeds or directions, shear forces cause them to break apart, opening a crevasse. Crevasses are seldom more than 46 m (150 ft) deep ...
Erosional landforms. As the glaciers expand, due to their accumulating weight of snow and ice they crush, abrade, and scour surfaces such as rocks and bedrock.The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, roches moutonnées, overdeepenings and hanging valleys.
The Bolam Glacier is a glacier situated on the northern flank of Mount Shasta, in the U.S. state of California. [ 2 ] [ 3 ] It is the second longest glacier in California behind the nearby Whitney Glacier , and the fourth largest and most voluminous after the neighboring Hotlum Glacier , Whitney Glacier, and Wintun Glacier . [ 4 ]
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The Matthes Glaciers are a group of glaciers east of the Glacier Divide in the Sierra Nevada, in the U.S. state of California. The glaciers were named for François E. Matthes. [1] There are approximately 10 small glacierets situated above 12,200 feet (3,700 m) in the John Muir Wilderness of Sierra National Forest which comprise the Matthes ...