Term: Petroleum, Description: Naturally occurring hydrocarbon liquid found underground, Question: Is the substance formed when large quantities of dead organisms are buried and put under intense heat and pressure also used to in the formation of laboratory opals?, Answer:No
Fact1: Petroleum is formed when large quantities of dead organisms are buried underneath rock and subjected to both intense heat and pressure. Fact2: Synthetic Opals are made in a laboratory with silica spheres and polymer resin. 