Feb 27, 2017. 1  Tonight, Casey Affleck took home the Academy Award for Best Actor for his role in Manchester by the Sea. While this might be a reason for celebration for the new Oscar-winner, not everyone was so eager to join in with the applause.
Bituminous coal is a sedimentary rock. Anthracite coal is considered a metamorphic rock.
The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Steam coal is a grade between bituminous coal and anthracite, once widely used as a fuel for steam locomotives. 2  In this specialized use, it is sometimes known as sea-coal in the US. 3  Small steam coal (dry small steam nuts or DSSN) was used as a fuel for domestic water heating.