Deposits by Glaciers material carried by glaciers is
Deposits by Glaciers ¡ ¡ ¡ material carried by glaciers is deposited by melting deposits of glacial origin are called drift. 2 kinds of drift: Till and outwash Till at the edge of a glacier Glacial outwash plain
Types of Drift: Till ¡ ¡ Till is left under or along the sides of a moving glacier un-sorted and unstratified. Outwash ¡ ¡ Outwash is deposits from streams of glacial meltwater sorted and stratified
Moraines Ground moraines form a thin, fairly even deposit over the area of the glacier ¡ Lateral and medial moraines form ridges ¡ End moraines form a ridge at the ice front ¡ when a glacier recedes, recessional moraines form ¡ Terminal moraines mark the glaciers farthest advance ¡
Glacial Erratics ¡ ¡ Large glacial boulders are called erratics Don’t match the surrounding terrain
Drumlins: ¡ ¡ ¡ Drumlins are long, smooth canoe-shaped hills made of till point in the direction of glacier movement Likely formed when an advancing glacier swept over a previous moraine
Outwash Plains and Eskers: Outwash plains= overlapping fans of gently sloping, stratified, meltwater deposits u in front of glacier u Form broad flat areas u
Eskers: Subglacial stream tunnels leave deposits as winding ridges called Eskers.
Kames, Kettles and Deltas ¡ ¡ ¡ Kames = small cone-shaped hills of stratified sand gravel, formed by stream deposits Kettles = circular hollows found on outwash plains, formed by melting blocks of buried ice. Deltas may form when glacial streams empty into lakes.
Lakes Made by Glaciers ¡ ¡ ¡ Glaciation leaves new basins or depressions in the land surface These may fill with water to form lakes, ponds, or swamps. Types of lakes: Cirque lakes, Kettle lakes, Moraine dammed lakes, Valley scoured lakes.
Glacier Jeopardy!
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