The lab analyzed a sample of coal-tar to determine its carcinogenic compounds.

The museum displayed a lump of candle coal next to the mining tools to illustrate nineteenth-century fuel sources.

The museum's display included a rare sample of canal coal alongside fossils from the same seam.

After the storm, the beach was littered with sea coal and fragments of timber.

The mining company conducted surveys to evaluate the thickness and quality of the coal beds before applying for permits.

At the rally, a few drivers started to roll coal as a show of defiance.

Before starting the excavation, miners examined the coal seams for signs of methane pockets.

The painter mixed several coal blacks to achieve the perfect depth of shadow on the canvas.

During the field trip, the geology students carefully documented the coal balls exposed in the peat bed.

The factory disposed of several barrels of coal oils following the inspection.