How does Roche Moutonnee form?

How does Roche Moutonnee form?

In glaciology, a roche moutonnée (or sheepback) is a rock formation created by the passing of a glacier. The passage of glacial ice over underlying bedrock often results in asymmetric erosional forms as a result of abrasion on the “stoss” (upstream) side of the rock and plucking on the “lee” (downstream) side.

How are crag and tails formed?

A Crag and Tail consists of a large mass of resistant rock on the STOSS (upslope side) and a gently sloping tail (on the LEE side) of less resistant rock. This is a geological formation caused by the passage of a glacier over an area of hard rock and softer rock.

What is a Roche Mouton?

Roches moutonnées are asymmetric bedrock bumps or hills with a gently sloping and abraded upglacier (stoss) face and a quarried (or plucked) downglacier (lee) face that is typically blunter1,2.

How big is a Roche Moutonnee?

Roches moutonnees vary in size from less than 1 m across (Rastas & Seppala, 1980) to several hundred metres or even kilometres in size (Jahns, 1943; Sugden et al., 1992).

How are knock and Lochan formed?

Knock and lochan landscapes consist of knocks, small rounded hills with no vegetation, and lochs, small lakes. These features are created by intense erosion of an area by an ice sheet. The lochs are formed by overdeepening and the knocks are more resistant bedrock. Drift is the term for all glacial sediment.

How do crags form?

Crags are formed when a glacier or ice sheet passes over an area that contains a particularly resistant rock formation (often granite, a volcanic plug or some other volcanic structure). The force of the glacier erodes the surrounding softer material, leaving the rocky block protruding from the surrounding terrain.

What is an example of a crag?

The definition of crag is the neck or throat area, or a rugged rock that sticks out from a mass of rocks. An example of a crag is an animal’s throat. An example of a crag is a sharp, large rock poking out from a mountain. A steep, rugged rock that rises above others or projects from a rock mass.

How does a corrie form?

Definition: A corrie is a horseshoe-shaped valley which is formed through erosion by ice or glaciers. Corries are north-facing, away from the sun which stops the ice from melting. As snow and ice build-up, the underlying rock is eroded. The formation of corries happened a long time ago, during the last ice age.

What is Stoss side?

Stoss is an English word meaning “the upflow side” (“stoss side” is the opposite of lee side, and a more general term for “windward side”, also applying to flows of liquids and solids). Stoss (Stoß) is a German word meaning “shock, impact”.

What is ice sheet scouring?

The action of an ice sheet or glacier in eroding the land and producing and shaping landforms; an instance or episode of this.

How is a fjord formed a level geography?

Fjords are found in locations where current or past glaciation extended below current sea level. A fjord is formed when a glacier retreats, after carving its typical U-shaped valley, and the sea fills the resulting valley floor.

What do crag means?

a steep rugged rock or cliff
1 : a steep rugged rock or cliff. 2 archaic : a sharp detached fragment of rock. crag. noun (2)

Why is it called the crag?

crag (n.) “a steep, rugged rock; rough, broken, projecting rock, especially a sea-cliff,” early 14c. (as a place-name element from c. 1200), probably from a Celtic source akin to Old Irish crec “rock,” and carrac “cliff,” Welsh craig “rock, stone,” Manx creg, Breton krag.

What is the shape of corrie?

armchair-shaped hollow
A corrie is an armchair-shaped hollow found on the side of a mountain. This is where a glacier forms. In France corries are called cirques and in Wales they are called cwms.

What is difference between cirque and corrie?

Cirque is a type of glacial erosional landform. It is also known as a corrie. They are deep, long and wide troughs or basins with very steep concave to vertically dropping high walls at its head as well as sides. A cirque is basically a bowl-shaped depression formed by the erosional activity of a glacier.

What is Stoss therapy?

Stoss therapy is the oral or intramuscular administration of high-dose vitamin D in the short term. In this method, the total dose of vitamin D administered is 300,000 IU (7500 µg) to 500,000 IU (12,500 µg), as a single dose or two to four divided doses, given at intervals of days to several weeks.

What is a Stoss in geography?

Quick Reference. Terms referring to the up-glacier and down-glacier slopes respectively of a rocky obstacle that has been glaciated. The stoss slope is smoothly abraded, the lee slope roughly plucked. A landscape dominated by such features is said to have ‘stoss-and-lee topography’.

What are drumlins and eskers formed by?

The sediments are left behind as a ridge in the landscape as the ice retreats. Thus, the correct answer is Option ‘D’ Glacial action i.e, Eskers and Drumlins are features formed by glacial action.

What is crag and tail topography?

A landform consisting of a rock hill and tapering ridge, which is produced by selective erosion and deposition beneath an ice sheet.