how many types of coal?
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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
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ᴄᴏᴀʟ ɪꜱ ᴄʟᴀꜱꜱɪꜰɪᴇᴅ ɪɴᴛᴏ ꜰᴏᴜʀ ᴍᴀɪɴ ᴛyᴩᴇꜱ, ᴏʀ ʀᴀɴᴋꜱ: ᴀɴᴛʜʀᴀᴄɪᴛᴇ, ʙɪᴛᴜᴍɪɴᴏᴜꜱ, ꜱᴜʙʙɪᴛᴜᴍɪɴᴏᴜꜱ, ᴀɴᴅ ʟɪɢɴɪᴛᴇ.
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