Which sequence furthers scientific knowledge

In attempt to solve the working problems created by the industrial revolution, the united states and many countries in europe considered and/or adopted

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

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?