We all have natural resources(so what do you understand by crude oil) which was created by nature

Mixture of naturally occurring unrefined petroleum product composed of hydrocarbons that is refined into diesel, gasoline, heating oil, jet fuel, kerosene, and literally thousands of other products called petrochemicals. Crude oils are named according to their contents and origins, and classified according to their per unit weight (specific gravity). Heavier crudes yield more heat upon burning, but have lower API gravity and market price in comparison to light crudes.Liquid petroleum as it comes out of the ground is known as crude oil.
Crude oil is the petroleum liquids as they come from the ground, formed from dead animal and vegetable material which collected at the bottom of ancient seas. Crude oil is petroleum which has not been refined.

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Crude oil is typically obtained through drilling, where it is usually found alongside other resources, such as natural gas (which is lighter, and therefore sits above the crude oil) and saline water (which is denser, and sinks below). It is then refined and processed into a variety of forms, such as gasoline, kerosene and asphalt, and sold to consumers.

Crude oil is a naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials. A type of fossil fuel, crude oil can be refined to produce usable products such as gasoline, diesel and various forms of petrochemicals. It is a nonrenewable resource, which means that it can't be replaced naturally at the rate we consume it and is therefore a limited resource
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Crude oil is obtain through drilling where it is found alongside other resources such as natural gas and saline water, it so then refined or process into variety of forms such as kerosene, and asphalt, gasoline and sold out to customers, Crude oil is typically obtained through drilling, where it is usually found alongside other resources, such as natural gas (which is lighter, and therefore sits above the crude oil) and saline water (which is denser, and sinks below). It is then refined and processed into a variety of forms, such as gasoline, kerosene and asphalt, and sold to consumers.

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Crude oil is created through the heating and compression of organic materials over a long period of time. Most of the oil we extract comes from the remains of prehistoric algae and zooplankton whose remains settled on the bottom of an Ocean or Lake. Over time this organic material combined with mud and was then heated to high temperatures from the pressure created by heavy layers of sediment. This process, known as diagenesis, changes the chemical composition first into a waxy compound called kerogen and then, with increased heat, into a liquid through a process which is called catagenesis.

Although it is often called "black gold," crude oil has ranging viscosity and can vary in color from black and yellow depending on its hydrocarbon composition. Distillation, the process by which oil is heated and separated in different components, is the the first stage in refining

Crude oil is a natural resources which is created by nature.

Thanks regard @tegasweet