| Answer | Crossword Clue |
|---|---|
| HALLEY | He discovered a comet. |
| HALLEY | He has a comet named after him |
| MARKTWAIN | He came and went with Halley's Comet |
| PONCEDELEON | He discovered Florida. |
| ERIC | He discovered Greenland. |
| ERICTHERED | He discovered Greenland |
| DESOTO | He discovered the Mississippi |
| AMERIGOVESPUCCI | He discovered the Amazon |
| DESOTO | He discovered the Mississippi. |
| ROENTGEN | He discovered X-rays |
| CHESTERAARTHUR | He discovered an "earth trash cure"? |
| CARTIER | He discovered the St. Lawrence, 1534. |
| CARVER | He discovered many uses for peanuts (1864-1943). |
| PTOLEMY | He discovered evection, the irregularity in the moon's orbit |
