| Answer | Crossword Clue |
|---|---|
| IRON | Primary component of the earth's core |
| exarch | (of a primary xylem or root) developing from the center; having the youngest cells closest to the core |
| endarchy | (of a primary xylem or root) developing from the periphery; having the oldest cells closest to the core |
| endarch | (of a primary xylem or root) developing from the periphery; having the oldest cells closest to the core |
| IRON | Much of the earth's core |
| nife | the earth's hypothetical core of nickel and iron |
| nifes | NIFE, the earth's hypothetical core of nickel and iron |
