Liquid Fossil Fuel
This page is the CodyCross answer for the clue below from The 1950s, Group 1811, Puzzle 1 (Silk Scarves).
Question
Liquid Fossil Fuel
Answer
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.