abrasion in glaciers abrasion occurs when rocks and stones are picked up by the glacier and are...
TRANSCRIPT
Abrasion• In glaciers abrasion occurs when rocks and
stones are picked up by the glacier and are rubbed against the bedrock at the bottom and side of the glacier as it moves.
Arête• A steep-sided, sharp-edged bedrock ridge formed by two
glaciers eroding away on opposite sides of the ridge.
Drumlin• Drumlins are formed of till. They are elongated features
that can reach a kilometer or more in length, 500m or so in width and over 50m in height. One end is quite step,
whilst the other end tapers away to ground level.
Esker• a long, narrow, winding ridge composed of stratified
sand and gravel deposited by a glacial melt water stream. Eskers may range from 16 to 160 feet in height, from 160 to 1,600 feet in width, and a few hundred feet
to tens of miles in length.
Erratics• Glacial erratics are stones and rocks that were
transported by a glacier, and then left behind after the glacier melted.
Striations• Glacial striations are scratches or gouges
cut into bedrock by glacial abrasion.
Horn• is an angular, sharply-pointed mountain peak which
results from the cirque erosion due to multiple glaciers diverging from a central point.
Kettle Lake• A kettle (kettle hole, pothole) is a shallow, sediment-filled
body of water formed by retreating glaciers or draining floodwaters.
Moraine• are long, sharply crested ridges made up of a mixture of
sand, gravel, and rocks that have been deposited by a melting glacier
Tarn• A tarn is a mountain lake or pool, formed in a cirque
excavated by a glacier. It is formed when either rain or river water fills the cirque. A moraine may form a natural dam below a tarn.
Cirque• The concave amphitheatre shape is open on the downhill
side corresponding to the flatter area of the stage, while the cupped seating section is generally steep, cliff-like slopes down which ice and glaciated debris combine and converge from the three or more higher sides.