Solid fuels

Coal is a combustible black or brownish-black sedimentary rock, formed as layers called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. It is a fossil fuel, formed when plants decay into peat which is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits formed from wetlands called coal forests that covered much of the tropics during the late Carboniferous and early Permian.

thumb|upright=1.3|Gunpowder for muzzleloader|muzzleloading firearms in granulation size thumb|American Civil War re-enactors volley firing with black powder thumb|Flash pan starter dispenser

thumb|A lump of peat thumb|Peat stacks in Südmoslesfehn (Oldenburg (district)|district of Oldenburg, Germany) in 2013 thumb|Peat gatherers at Westhay, [[Somerset Levels in 1905]] thumb|Peat extraction in East Frisia, Germany in 1987

a grey, hard, and porous fuel with high carbon content and few impurities

propellant used in firearms and artillery

rocket with a motor that uses solid propellants

thumb|Kingsford (charcoal)|Kingsford charcoal briquettes

thumb|right|250px|Sugarcane bagasse in Hainan, China Bagasse ( ) is the dry pulpy fibrous material that remains after crushing sugarcane or sorghum stalks to extract their juice. It is used as a biofuel for the production of heat, energy, and electricity, and in the manufacture of pulp and building materials. Agave bagasse is similar, but is the material remnants after extracting blue agave sap.

solid carbon-rich material

solid material that can be burnt to release energy

Fuel source made from green waste

sugar-based rocket propellant

German brand for solid fuel in tablet form

solid-rocket propellant

charcoal made from bamboo

thumb|A petroleum-based fire starter for grills, camp fires, stoves or ovens thumb|A variety of firelighters on sale in a German supermarket