What Balloons Are Filled With
This page is the CodyCross answer for the clue below from Farm, Group 464, Puzzle 3 (Seed Drills).
Question is: What Balloons Are Filled With
and the answer is: HELIUM
Word Meaning:
HELIUM — (uncountable) The second-lightest chemical element (symbol He), with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
Definitions from Wiktionary.