Mar templado de la corriente del Pacífico

agua corriente
pejesapo lenguado

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.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"

answer; convade;