The P in Opec, Which Moved to Vienna in 1965
This page is the CodyCross answer for the clue below from Rainforest, Group 1209, Puzzle 4 (Rubber Tree).
Question is: The P in Opec, Which Moved to Vienna in 1965
and the answer is: PETROLEUM
Word Meaning:
PETROLEUM — A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under the Earth's surface.
Definitions from Wiktionary.