[Ibredd]

Those chloroflourocarbons R12 are heavier than air so they fall instead of rise.

[ElTianti]

Those chloroflourocarbons R12 are heavier than air so they fall instead of rise.

That was something that puzzled me; how a molecule comprised of elements all which are heavier than oxygen or nitrogen could find its way to the top of the atmosphere. The other thing that left me nonplused was how this product of civilization would find it way to the furthest spot from civilization.

[Smartaleck]

"Those chloroflourocarbons R12 are heavier than air so they fall instead of rise."

Under normal conditions. Chemicals react in the atmosphere when subjected to the presence of light, other chemicals yadda yadda yadda.