Glacial striations gouged into bedrock allow geologists to understand _____.
Glacial striations gouged into bedrock allow geologists to understand the mass and pressure caused by glaciers resulting in the movement of glaciers.
As glaciers move, boulders, rocks, and pebbles are pushed underneath the glacier. The pushing of these rock formations scratch and gouge out the land on which they reside. These scratches and gouges that are caused by the movement of glaciers are called glacial striations.
Glacial striations reveal certain facts to geologists.
1. Glacial striations help geologists determine the direction that the glacier moved.
2. Secondly, glacial striations can reveal the type of material that was moved by the glacier. For example, deep glacial striations are indicative of large boulders being carried by the glacier. Polished bedrock caused by a glacial striation is indicates that the glacier carried finer sediments.
3. Thirdly, glacial striations can be indicative of the speed of the glacier. For example, if a glacial abrasion indicates that there was a lot of debris carried by the glacier (by the size of the striation left behind), then it can be assumed that the glacier moved slowly.