GEOL 1010 Lecture Notes - Lecture 9: Headward Erosion, Valley, Rock Flour
16 Dec 2018
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Document Summary
Abrasion creates polish, striations grooves in bedrock, features that show flow direction. Rock flour gives glacial lakes color finely ground minerals. Features of alpine glaciers= cirques, bowl shaped depression from which way a glacier flows. Ar tes are sharp ridges formed when cirques erode into each other from either side of a mountain range. Horns are spires of rock from headward erosion of cirques around a single peak (pointy top). Glacial valleys are u-shaped, broad stream valleys in bedrock are v-shaped. Fiords drowned glacial valleys form when ice melts and sea level rises. When sea level rises, it fills in the valley. Hanging valley is stranded above the main glacial valley, they form a tributary glacier. Till is unstratified unsorted deposited by ice when it melts. Medial moraines form where two tributary glaciers merge from valleys. End moraines show furthest advance of glaciers are the end of a glacier. End moraines are common in the east coast (i. e. long island).
