1. product of mass and velocity for a moving body; impetus.   momentum   pterodactyl   suture   panacea   Hint Half-n-half Clue   2. unit for measuring light energy.   lumen   terminology   isotope   patina   Half-n-half Clue   3. incompatibility or lack of uniformity.   inconsistency   incline   insomnia   marsupial   Half-n-half Clue   4. size or extent.   refraction   solvent   magnitude   marsupial   Half-n-half Clue   5. time when sun is farthest from the equator.   terminology   vortex   solstice   plasticity   Half-n-half Clue   6. outer boundary for closed figure.   penumbra   parasite   pachyderm   perimeter   Half-n-half Clue   7. bending of a ray of light due to change in density.   refraction   syllogism   trough   magnitude   Half-n-half Clue