Explain erosion work by glaciers.
Answers
14.10 Erosion by Glaciers
FlexBooks® 2.0 > CK-12 Earth Science For Middle School > Erosion by Glaciers
In what ways is this glacier creating distinctive landforms?
This glacier is modifying the landscape it's flowing through. Glaciers erode and deposit telltale landforms. They show the direction a glacier flowed and how far it advanced. They create fantastic and unique features in mountain areas. Did glaciers leave clues where you live? If you live in the northern part of the United States, you might be able to find some. Would you know what to look for?
Erosion by Glaciers
Like flowing water, flowing ice erodes the land and deposits the material elsewhere. Glaciers cause erosion in two main ways: plucking and abrasion.
Plucking is the process by which rocks and other sediments are picked up by a glacier. They freeze to the bottom of the glacier and are carried away by the flowing ice.
Abrasion is the process in which a glacier scrapes underlying rock. The sediments and rocks frozen in the ice at the bottom and sides of a glacier act like sandpaper. They wear away rock. They may also leave scratches and grooves that show the direction the glacier moved. These grooves are called glacial striations.
Valley Glaciers
Valley glaciers create several unique features through erosion.
As a valley glacier flows through a V-shaped river valley, it scrapes away the sides of the valley. It carves a U-shaped valley with nearly vertical walls (Figure below).
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