Which of the following is not an agent of weathering?" Glacier

Wind

Precipitation

Soil

Soil is the material which is formed as the result of wethering hence it is not the agent of wethering and this is the right answer.

soil is not an agent of weathering

thinking it would be d not too sure but i think it's right

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.