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Anthracite is the hardest type of coal.
Anthracite is the hardest type of coal.
Anthracite is the hardest type of coal.
anthracite
Anthracite, the hardest coal, forms from the greatest pressure.
what is the oldest type of architectural designs called
The oldest type of play is called Noh
supernovas
the type are called archaebactiera
lignite
lignite
because the carbon dioxided in the coal and it has a type of substance that is in the coal body called the : dialkyl , arylmethyknene , and sulfonium