Glaciers
Glaciers form over a lot of years when snow and ice build up faster that snow and ice is removed. The rom all of snow and ice is called ablation and includes the process of melting and evaporation.
When individual snowflakes are crushed by the immense weight pressure, air is squeezed from the snow turning into a very dense glacial ice.
Researchers are able to find out the direction of historical glaciers by observing bedrock scrapings such as glacial straitions and chatter marks.
As glaciers move they erode the terrain beneath the while using 2 main processes. Plucking, whereby bedrock is softened and levered out by subglacial water constantly re-freezing (expanding) within it, the sediment then becomes part of the glacier's cargo. Abrasion happens when the ice and now rock also slides over the bedrock essentially smoothing and polishing.
Studies of glacial deposits also help show where historical glaciers were and how the moved. Linear mounds of glacial sediment called moraines are formed and left by the deposition of material from glaciers. While drumlins are teardrop shaped groups of hills also containing left behind sediment deposits.
The study of glaciers is very important for scientists to keep track of unique variations in the Earth's climate as glaciers are very sensitive to climatic changes.
Researchers are able to find out the direction of historical glaciers by observing bedrock scrapings such as glacial straitions and chatter marks.
As glaciers move they erode the terrain beneath the while using 2 main processes. Plucking, whereby bedrock is softened and levered out by subglacial water constantly re-freezing (expanding) within it, the sediment then becomes part of the glacier's cargo. Abrasion happens when the ice and now rock also slides over the bedrock essentially smoothing and polishing.
Studies of glacial deposits also help show where historical glaciers were and how the moved. Linear mounds of glacial sediment called moraines are formed and left by the deposition of material from glaciers. While drumlins are teardrop shaped groups of hills also containing left behind sediment deposits.
The study of glaciers is very important for scientists to keep track of unique variations in the Earth's climate as glaciers are very sensitive to climatic changes.
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