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

Which of the following definitions best describes 'drainage process'?

A. A material transport process during which a mass of air moves through an atmosphere towards a planetary surface.
B. A material transport process during which a liquid which is not absorbed or otherwise held in place by a material is transported away from its location.
C. A process during which pieces of a planetary crust and uppermost mantle move.
D. A the concept is a process in which a portion of some substance segregates from a material in which that substance or its precursors were dissolved or suspended in and settles due to a force such as gravity or centrifugal force.

Answer: A material transport process during which a liquid which is not absorbed or otherwise held in place by a material is transported away from its location.