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

Which of the following definitions best describes 'periglacial lake'?

A. A lake, part of whose margin is formed by an ice mass, ice cap or glacier, the ice having obstructed the natural drainage of the land.
B. A lake permanently covered by ice.
C. A the concept formed either by the damming action of a moraine or ice dam during the retreat of a melting glacier, or one formed by meltwater trapped against an ice mass due to isostatic depression of the crust around the ice.
D. One of a series of glacial lakes connected by a single stream or a braided stream system.

Answer: A lake, part of whose margin is formed by an ice mass, ice cap or glacier, the ice having obstructed the natural drainage of the land.