Oil is a finite resource that is formed from the remains of ancient plants and animals. It is usually found underground in rock formations beneath the sea. To collect oil, deep wells are drilled and large pumps are used to bring the crude oil to the surface. Once collected, crude oil is refined and separated into useful products like gasoline, diesel, and other petroleum products that are crucial to modern life and industry. However, oil is a non-renewable resource that will run out by the 2100s, so better management of this important but finite industry is needed to reduce its environmental impacts.