Which of the non renewable fuels is the most expensive to use and to manage

Coal, oil, natural gas

Explanation:

These are three of the most expensive non-renewable resources.

b - the respond is innate and varies over time.

good luck!

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.