Which resource takes the longest amount of time to renew?

a-natural gas


b-solar power


c-hydroelectric power


d-nuclear energy|||d-nuclear energy, you have to wait for a star to blow up to create the heavy elements, so it is really not "renewable" at all, though I suppose one could say the same about solar.





the large underground deposits of natural gas take millions of years, but one can get methane from decaying organic matter pretty quickly. I think most hydro power come from melting snow, so it is renewed each winter, and to some extent every time it rains.