Coal is solid fossil fuels formed primarily from ancient swamp plants, especially during the Carboniferous.
(Coal; is; solid fossil fuels formed primarily from ancient swamp plants, especially during the Carboniferous) (solid fossil fuels; formed; T:especially during the Carboniferous)
Coal solid fossil fuels
is formed
solid fossil fuels formed primarily from ancient swamp plants, especially during the Carboniferous
T:especially during the Carboniferous