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

Which of the following definitions best describes 'cirque'?

A. An amphitheatre-like valley head, formed at the head of a valley glacier by erosion.
B. A fan-shaped body of sediments deposited by braided streams from a melting glacier. Sediment locked within the ice of the glacier gets transported by the streams of meltwater and deposits on the outwash plain at the terminus of the glacier.
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. Any glacially formed accumulation of unconsolidated glacial debris (soil and rock) which can occur in currently glaciated and formerly glaciated regions.

Answer: An amphitheatre-like valley head, formed at the head of a valley glacier by erosion.