Continued pressure and heat on the peat gradually drove out gases and moisture, hardened the material and changed it from PEAT to LIGNITE to BITUMINOUS COAL and finally to
ANTHRACITE. This sequence represents increase in RANK of coal.
Continued pressure and heat on the peat gradually drove out gases and moisture, hardened the material and changed it from PEAT to LIGNITE to BITUMINOUS COAL and finally to
ANTHRACITE. This sequence represents increase in RANK of coal.