Fossil fuels are the energy source that form over as a result of the and partial of plants and other organic matter. Blank 1: Blank 2: Blank 3:

Thousands and millions of years, burial and partial decomposition

Explanation:

Fossils are the ancient remains of plants and animals that are buried millions and thousands of years, and which are of great geological importance. The fuels obtained from these fossils are known as fossil fuels. For example, Coal, Petroleum and Natural gas.

These are formed from the partial decomposition of organic matter such as the remnants of plants and animal bodies. In order to become a fossil, the dead organic matter must be comprised of hard parts, that are needed to be buried and detached from the oxygenated environment, which alters and forms fossils over a large geological time.