Where is crude oil primarily found?

Crude oil is primarily found in rocks, specifically in sedimentary rock formations. These formations act as reservoirs where organic materials have been buried and subjected to heat and pressure over millions of years, resulting in the formation of hydrocarbons that make up oil. The geological conditions and the right type of rock are essential for the accumulation of crude oil, which is why exploration for oil often focuses on these sedimentary rock layers.

Other options do not serve as suitable sources for crude oil. For example, while oceans can be involved in the transportation and distribution of oil once extracted, they do not house crude oil in its natural state. Forests and the atmosphere also do not contain crude oil; forests are primarily ecosystems composed of trees and plants, and the atmosphere is mostly air and gases, neither of which can support the formation or presence of crude oil.