Aheat engine is a device that uses__ to produce useful work

Do your question makes like no sense so I'm just going to explain what it is... ~~A heat engine is a device that repeatedly converts thermal energy into kinetic energy. It needs the difference of temperature and a working substance with high rate of expansion to do a useful work for us.~~ if you want details of what they do and an in depth explaination just let me know ~~ hope this helped~~

here are some information of the future of geothermal energy:

-the future of geothermal energy can pretty much be summed up with a single word: more

-scientists plan in going deeper than 120 meters

-we are hoping that one day, we will get all of our energy from renewable energy sources such as geothermal energy

hope this !

b.a device that inputs heat into a cool object