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

Which of the following definitions best describes 'silica dust'?

A. Dust which is composed of fibrous material.
B. Dust which is composed primarily of slicon dioxide.
C. Dust which is derived from clay material.
D. Dust which is primarily composed of hydrated magnesium silicate (talc) particles.

Answer: Dust which is composed primarily of slicon dioxide.