1. residue from smelting operation.   summation   slag   solvent   vertex   Hint Half-n-half Clue   2. time when sun is farthest from the equator.   velocity   momentum   innovation   solstice   Half-n-half Clue   3. similarity or state of being parallel.   inconsistency   terminology   indices   parallelism   Half-n-half Clue   4. passing from one state to another.   transition   pachyderm   touchstone   vertex   Half-n-half Clue   5. quantity that can be defined or that can limit.   stratum   propellant   parameter   respiration   Half-n-half Clue   6. finding the total or summary.   magnitude   parasite   summation   slag   Half-n-half Clue   7. layer of earth's crust or society.   parallelism   patina   mammal   stratum   Half-n-half Clue