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 Note un-sorted vs. sorted What is the main difference in grain size? Why? Dumped versus carried out by water Till at the edge of a glacier Glacial outwash plain

Types of Drift: Till Outwash Till is left under or along the sides of a moving glacier un-sorted and un-stratified. Outwash is deposits from streams of glacial meltwater sorted and stratified Till is melted and dumped Outwash has time to settle

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 How do we get a medial moraine? Put these in the right order, closest to farthest from the ice front……..use board Terminal, End, Recessional

Glacial Erratics Large glacial boulders are called erratics Don’t match the surrounding terrain Like our coffee beans and popcorn from last day

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 Not easy to see from on the ground but can get a great view from an airplane

Outwash Plains and Eskers: Outwash plains= overlapping fans of gently sloping, stratified, meltwater deposits in front of glacier Form broad flat areas Time for gravity to have an effect, the heaviest deposits fall out first

Eskers: Subglacial stream tunnels leave deposits as winding ridges called Eskers. Long winding ridges from tunneled glacial streams

Kames, Kettles and Deltas Kames = small cone-shaped hills of stratified sand and 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. Kames-steep mounds or cone shaped hills composed of stratified drift of diverse origin - form in holes in the ice where sediment accumulates and once the ice melts it leaves the heap of sediment behind.  Kettles: block is trapped under deposits, once melts the deposits cave in Eskers: form in tunnels in the ice sheet. -The sides of the tunnel act as part of the channel for a melt water stream. -As the glacier recedes, the support for the stream is removed and the stream deposits its load into a long ridge-like form.

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. Explain moraine dammed lake

Glacier Jeopardy!