Assertion: fuel cell's fuel | /r/HasProperty | coal
Facets:
value: mainly
type: DEGREE
Source sentences:
text: Solid fuels include wood , charcoal, peat, coal, hexamine fuel tablets, and pellets made from wood (see wood pellets), corn, wheat, rye and other grains.
text: Fossil fuels contain high percentages of carbon and include coal, petroleum, and natural gas.
text: Fossil fuels, which mainly include petroleum, coal and natural gas, provide for the major extent of energy needs around the globe today.