Oil is considered a non-renewable resource because it takes millions of years to form naturally. The process begins with the remains of ancient marine organisms, such as plankton and algae, which settled on the ocean floor. Over time, these organic materials were buried under layers of sediment and subjected to intense heat and pressure. This slow transformation eventually turned the organic matter into oil.
Since this process takes millions of years, the rate at which oil is consumed far exceeds the rate at which it is formed. Once the existing oil reserves are depleted, they cannot be replenished within a human timescale. This makes oil a finite resource, and its non-renewable nature has significant implications for energy production and environmental sustainability.