Petroleum, also called ____, is a fossil fuel. Petroleum was formed from the remains of ancient marine ____, such as plants, algae, and bacteria. Over millions of years of intense ____, these organic remains (fossils) transformed into carbon-rich substances we rely on as raw materials for fuel and a wide variety of products. The processing of crude oil is called ____, which is a technique for separating and purifying liquid substances based on their ____ points. The ____ that we depend on for transportation to school, work, or vacation comes from crude oil. Petroleum is also used in liquid products such as nail polish, rubbing alcohol, and ammonia. The use of fossil fuels releases the ____ that is underground and upsets the carbon budget. This affects the quality of our air, water, and overall ____. Gasoline and diesel directly ____ the atmosphere. They emit ____ compounds and particulates.

Petroleum

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