Question

What are the four types of coal? Write their names in order so that less efficient
comes first. Mention two main important factors that affect the efficiency of the
coal.​

Answer 1

Answer:

anthracite, bituminous, subbituminous, and lignite.

Explanation:

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.