Where do supporters of the outside-in model say earth’s water originated from? inside of volcanoes inside the atmosphere bonded to meteorites that hit the earth bonded to minerals in earth's mantle

Bonded to meteorites that hit the Earth

Explanation:

Some hypothesis refering to origin of water on Earth sugges, that a very long time ago as asolar system was young, some asteroids may have landed also carrying frozen water. The meteorites would then turn to provide liquid water, these meteorites were protoplanets from the outer asteroid belt that is in the solar system.

However this still is not the mainstream theory.

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.