| Answer | Crossword Clue |
|---|---|
| GOALLINE | End zone boundary |
| KNEES | Strike-zone boundary |
| KNEES | Strike zone boundary |
| KNEE | Strike-zone boundary |
| TROPIC | Torrid Zone boundary |
| ANTARCTICCIRCLE | Frigid Zone boundary |
| TROP | Torrid Zone boundary: Abbr. |
| ANTARCTICCIRCLE | South Frigid Zone boundary |
| KNEES | Bottom boundary of the strike zone |
| ANTARCTICCIRCLE | Imaginary boundary for the South Frigid Zone |
| zonal | of, relating to, affecting, or having the form of a zone a zonal boundary |
