Oil and natural gas were created by the squeezing of what over a million years?

Oil and natural gas were formed from the remains of ancient marine organisms, primarily zooplankton and phytoplankton, that accumulated on the seafloor millions of years ago. Over time, layers of sediment buried these organic materials, and the immense heat and pressure transformed them into hydrocarbons. This process took millions of years, resulting in the fossil fuels we extract today.