Erosion:
* Plucking: As a glacier moves, it freezes onto rock and soil. As the glacier flows, it pulls or "plucks" these materials away from the bedrock. This process creates jagged, uneven landscapes and can leave behind depressions called cirques.
* Abrasion: The embedded rocks within the glacier act like sandpaper, grinding and smoothing the bedrock as the glacier moves. This creates polished surfaces, striations (scratches), and rock flour (pulverized rock).
Transportation:
* Glacial Movement: Glaciers flow slowly due to gravity and the pressure of the ice. This flow carries embedded rocks, sediment, and rock flour along with it.
* Deposition: As glaciers melt or reach lower elevations, they deposit the material they have been carrying. This deposited material is called glacial till, which is unsorted and contains a mix of different rock sizes.
Examples of Transportation:
* Moraines: Glacial till deposited at the edges or ends of glaciers forms ridges called moraines. Lateral moraines form along the sides of the glacier, while terminal moraines mark the glacier's furthest advance.
* Outwash plains: Meltwater from glaciers carries finer sediment and deposits it in areas called outwash plains. These areas often have well-sorted sediment, like sand and gravel.
* Erratics: Large boulders transported by glaciers and deposited far from their source are called erratics. They provide evidence of past glacial activity.
Summary:
Glaciers are powerful forces that can erode, transport, and deposit rock over vast distances. This process plays a significant role in shaping landscapes and creating unique geological features.
