Is the sun the only source of energy ?

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?