Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'rock glacier'?

A. A land surface characterised by very irregular surfaces of marshy hollows and small hummocks formed as ice-rich permafrost thaws.
B. Any glacially formed accumulation of unconsolidated glacial debris (soil and rock) which can occur in currently glaciated and formerly glaciated regions.
C. Rock glaciers are distinctive geomorphological landforms of blocky detritus which may extend outward and downslope from talus cones or from glaciers or the terminal moraines of glaciers. [Wikipedia]
D. A thin, almost knife-like, ridge of rock which is typically formed when two glaciers erode parallel U-shaped valleys.

Answer: Rock glaciers are distinctive geomorphological landforms of blocky detritus which may extend outward and downslope from talus cones or from glaciers or the terminal moraines of glaciers. [Wikipedia]