Tuesday, May 3, 2011

Glacial Erosion

Glacier is a large moving  body of ice from accumulation of snow and rain. The forms of glaciation occur  when more snow and ice fall then melt and evaporate for years. The more pressure occurs the more it  increasingly  converts the snow into ice. "The glacier carries with it the Dirt, gravels, rocks and boulders that it finds in its path as well as that embedded in the ice." Glacial erosion wears down and removes rocks and soilThe different forms of Glacial erosion  are Aretes, U and V-shaped valleys, Pyramids Picks, Cirque and more. The Youtube video explains the features of glaciation such as formation and processes.

                                          From youtube.com

"A glacier flows slowly due to stresses induced by its weight. The crevasses and other distinguishing features of a glacier are due to its flow. Another consequence of glacier flow is the transport of rock and debris abraded from its substrate and resultant landforms like cirques and moraines."  

A cirque is a curved shape that inward like a inner surface of a bowl formed on the head of a valley glacier by erosion  (erosion is a wearing away of rock or soil by physical breack down, chemical solution and transportation of materials caused by water, wind or ice.) “A cirque  opens  on the downhill side corresponding to the flatter area of the stage, while the cupped seating section is generally steep cliff-like slopes down which ice and glaciated debris combine and converge from the three or more higher sides.”

Also, moraines are  glacial landforms. "They are long, sharply crested ridges made up of a mixture of sand, gravel, and rocks that have been deposited by a melting glacier. There are many different moraines includes terminal and literal moraines:"
                         Literal Moraine forms parallel ridges of debris deposited along side of a glacier

                                 Terminal Moraine is also end moraine, which forms at end of the glacier