What kind of rock is coal?

Answer 1

It is a sedimentary rock, but the harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. It is composed primarily of carbon along with assorted other elements, including sulfur.

Answer 2

Coal is not a rock, but rather a combustible black or brownish-black sedimentary rock that is primarily composed of carbon, along with traces of other elements like sulfur, hydrogen, oxygen, and nitrogen. It is formed from the remains of plants that lived and died millions of years ago, and undergoes a process known as coalification to become the coal we use today for energy production.

Answer 3

Coal is a fossil, it is a sedimentary rock of organic origin.