geological hammer, on a coal wall. coal is a fossil fuel, being a non-renewable energy source.

geological hammer isolated coal wall fossil fuel being non-renewable energy source widely used generate electricity brazil industry used exploration fossilized coal fuel fossil energy non-renewable extraction mini work profession danger pickaxe hammer hatchet pick paleontology surface equipment geologist iron geologic natural pattern geological background rock material texture money wall people mine geology extract miner dark power nature resources stone environment mineral black