The physical laws that govern earths system involve

Matter and energy

Explanation:

The physical laws that mainly controls the entire system are the matter and energy. Both these two laws are neither created nor it can be destroyed, but it transforms from one kind to another. These are basic elements that circulates within the earth from one sphere to another, carrying out all the processes on earth. Every object present in earth is made up of matter and energy is continuously exchanged inside the system.

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.

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