What could have caused the decrease in ocean temperature near christchurch​

Water moving from the equator is warmer than would be expected based on latitude, and so is warmer than the air it passes.

Explanation:

Im not 100% but I hope It Helps.

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.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it