Crude oil is a natural liquid found deep inside the Earth. People often call it “black gold” because it is very valuable and has a dark color. It formed millions of years ago from tiny plants and animals that lived in ancient seas. When these living things died, they sank to the sea floor. Over time, heavy layers of sand, mud, and rock covered them. High heat and strong pressure underground slowly changed these remains into thick oil.
Today, crude oil is one of the most important sources of energy in the world. However, when workers pump it out of the ground, we cannot use it immediately. Raw oil is a thick mixture of many different chemicals. It must travel through long metal pipes or large ships to reach an oil refinery. At the refinery, workers heat the oil to separate it into useful products like gasoline, diesel, and kerosene.
Gasoline powers cars, while diesel fuels big trucks, buses, and trains. Planes need kerosene to fly safely across the sky. Oil also helps make plastic, clothing, roads, and medicines. Our modern life relies heavily on crude oil every single day.
