Clue: Mountains have developed over them

Answer: EONS

Length: 4

---

Similar Clues:

• Nanobot's hypothetical ability, and the process that's overtaken this puzzle's theme answers (SELFREPLICATION with 15 letters)
• "I haven't heard anything yet," or the theme of this puzzle (NONEWS with 6 letters)
• Title of a crossword with theme answers like OVERHAND KNOT, BUTTERFLY EFFECT, and CRAWL SPACE (THESTROKES with 10 letters)
• Bonkers ... or an overlapping word in four themed answers (MAD with 3 letters)
• Overly fond (DOTING with 6 letters)
• Overthrow first, e.g. (ERR with 3 letters)
• Overflow with, as charm (OOZE with 4 letters)
• Thanks overseas (MERCI with 5 letters)
• Hot weather refuge, and this puzzle's theme (COOLINGCENTER with 13 letters)
• Overcharge, informally (SCALP with 5 letters)