Coal and mineral oil are usually found embedded in

Coal and mineral oil are usually found embedded in sedimentary rocks. Sedimentary rocks are formed by the accumulation of sediment and organic matter over time, which is then compacted and cemented together. Coal is formed from the remains of plants that were buried in sedimentary basins and subjected to high pressure and heat over millions of years. Mineral oil, also known as petroleum, is formed from the remains of microscopic marine plants and animals that were buried in sedimentary basins and subjected to high pressure and heat over millions of years. Sedimentary rocks are the most common type of rock on the Earth's surface, and they contain a wide variety of minerals, fossils, and other organic matter. They are typically composed of layers or strata, with each layer representing a different period of deposition or environmental conditions. Coal and mineral oil are found in specific types of sedimentary rocks, such as shale and sandstone, which have the necessary characteristics to trap and preserve organic matter. Therefore, coal and mineral oil are usually found embedded in sedimentary rocks, which are formed by the accumulation of sediment and organic matter over time.