matter nuclei blacktop matter deconversion
black_spot is plant_disease. gaseous_mercury is gas. super_weakly_interacting_massive_particle is dark_matter. grey_matter is internal_body_part. gaseous_mercury is mercury. weakly_interacting_massive_particle is dark_matter. grey_matter is anatomical_structure. robust_association_of_massive_baryonic_objects is dark_matter. sterile_neutrino is dark_matter.