Imagine you are digging a hole to the center of the earth. in which order would dig through them? a. inner core, outer core, upper mantle, lower mantle, crust b. crust, upper mantle, lower mantle, outer core, inner core c. crust, outer core, inner core, upper mantle, lower mantle d. inner core, outer core, lower mantle, upper mantle, crust

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.