1. center of turbulence or whirling motion.   magnitude   vortex   vent   orifice   Hint Half-n-half Clue   2. band of colors formed when light passes though a prism.   spectrum   isotope   parasite   turbulence   Half-n-half Clue   3. dependence (of organisms) that is mutually beneficial.   objective   inconsistency   nomenclature   symbiosis   Half-n-half Clue   4. pattern with balance or harmony.   microcosm   suture   symmetry   perimeter   Half-n-half Clue   5. reasoning with major premise, minor premise and conclusion.   stratum   vise   syllogism   magnitude   Half-n-half Clue   6. layer of earth's crust or society.   nomenclature   perimeter   medium   stratum   Half-n-half Clue   7. path followed by body under forces.   strut   residue   kaleidoscope   trajectory   Half-n-half Clue