coal, n.All

coal mines can catch fire, burning for decades or even centuries.

Coal is the combustible sedimentary rock typically dispensed in lumps that your spoiled offspring deserve to find in their oversize stockings, but which you will relegate to an empty threat.

Coal is a portable climate.

Ironically enough, the first ever fully electric cargo ship (built by China) with 'no threat to the environment' is being used to haul coal to a power station.

Trees weren't biodegradable until bacteria and fungi evolved to eat dead wood. Coal comes mostly from unimaginably large forest fires that turned all the dead wood that had piled up into charcoal.

The roller coaster was first built in 1827 to carry coal from a mine to boats below.