| Answer | Crossword Clue |
|---|---|
| isonome | a line connecting points where a species is equally abundant |
| isonomes | ISONOME, a line connecting points where a species is equally abundant |
| isochasm | line on a map or chart connecting points where auroras are observed with equal frequency |
| isotach | line on a weather map or chart connecting points where winds of equal speeds have been recorded |
