* Coal seams: Coal is usually found in layers called "coal seams" within sedimentary rock formations. These seams can vary in thickness from a few inches to hundreds of feet.
* Swampy environments: Coal is formed from the remains of ancient plants, primarily ferns and trees, that grew in swampy environments. These swamps were abundant during the Carboniferous period (about 359 to 299 million years ago).
* Sedimentation and compaction: Over millions of years, these plant remains were buried under layers of sediment, such as mud, sand, and silt. The weight and pressure of these layers compacted the plant material, squeezing out water and gases. This process, along with heat, transformed the plant matter into coal.
* Different types of coal: The type of coal formed depends on the depth of burial, the pressure, and the heat involved. The most common types of coal are lignite, sub-bituminous, bituminous, and anthracite.
In summary: Coal is found in layers within sedimentary rocks, specifically in formations that were once ancient swampy environments. The process of coal formation involves the accumulation of plant material, burial, compaction, and transformation over millions of years.
