Round humps
A round hump ( French roche moutonnée ) is an adjacent rock that has been transformed into streamlined bodies by glacier masses .
Emergence
On the windward side of a rock obstacle, the pressure of the ice leads to a basal melting of the same and thus to the formation of a sliding film between the glacier and the rock. Here the glacial cut ( deterion ) creates a smooth, streamlined surface with glacier scrapes .
On the leeward side , when the pressure drops, the rock freezes to the base of the glacier, which means that individual blocks can be torn off at crevices ( detraction ). Furthermore, there is occasional frostblasting on the leeward side . These processes lead to a rough, mostly step-shaped surface finish on the lee side of a round hump.
Occurrence
Usually round humps are found in groups. In addition to the occurrence in high altitudes, they also exist on the coast, such as in Finland or Nova Scotia ( Canada ). As islands, they are called skerries or holm in the geomorphological sense .
