Water that has evaporated returns to the earth as?

Precipitation

Explanation:

When water evaporates, it forms clouds. Evaporation is when the sun makes bodies of water turn into clouds. I believe that is called condensation. Then when it rains,snows, hails or something like that, it is called precipitation.

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.