Creating a prototype and troubleshooting are steps in the development of

One of the essential early steps in the inventing process is creating a prototype--which, simply defined, is a three-dimensional version of your vision. Creating a prototype can also be one of the most fun and rewarding steps you'll take. That's because developing a prototype gives you the opportunity to really tap into your creativity, using those skills that inspired your invention idea in the first place. And whether you're making your prototype at home or hiring the services of an engineer, seamstress or machinist, it's truly exciting to see your idea transformed into something tangible and real.

The answer should be geothermal i hope i’m right message me if i’m wrong and i’ll change my answer and fix it for you

Ithink that its like 15 mph.