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

Which of the following definitions best describes 'confluence'?

A. A the concept is an intrusive igneous rock body that crystallized from a magma slowly cooling below the surface of the Earth. Plutons include batholiths, dikes, sills, laccoliths, lopoliths, and other igneous bodies. In practice, ‘the concept’ usually refers to a distinctive mass of igneous rock, typically kilometers in dimension, without a tabular shape like those of dikes and sills. Batholiths commonly are aggregations of plutons. The most common rock types in plutons are granite, granodiorite, tonalite, and quartz diorite. [Wikipedia]
B. The rate at which adjacent flow diverges along an axis oriented normal to the flow at the point in question; the opposite of confluence.
C. Low amplitude, continuous earthquake activity often associated with magma movement.
D. The rate at which adjacent flow is converging along an axis oriented normal to the flow at the point in question.

Answer: The rate at which adjacent flow is converging along an axis oriented normal to the flow at the point in question.