Question

why subbtiminous called lowest grade of coal​

Answer 1

Explanation:

Subbituminous coal is black in color and is mainly dull (not shiny). ... Lignite: Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon. Lignite has a low heating value and a high moisture content and is mainly used in electricity generation.

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Answer 2

Answer:

There are four major types (or “ranks”) of coal. Rank refers to steps in a slow, natural process called “coalification,” during which buried plant matter changes into an ever denser, drier, more carbon-rich, and harder material. The four ranks are:

Explanation:

1.Anthracite

2.Bituminous

3.Subbituminous

4.Lignite

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