Which is an accurate description of an equinox? a. the greatest distance from the sun in a planet’s orbit b. the time at which earth, moon, and sun are in a straight line c. the time of day when the sun is highest in the sky d. a day with an equal amount of daylight and darkness

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.