Match the following. match the items in the left column to the items in the right column. 1. accretion the gaseous layer of a planet usually retained by its gravity 2. atmosphere process of steady growth of an object by a steady accumulation of material 3. biosphere the water system of the earth; includes solid, gas, and liquid water 4. cryosphere a process creating different layered compositions of a planet 5. differentiation the rigid, crustal layer of earth 6. hydrosphere the system of earth by which living organisms exist 7. lithosphere the frozen water or ice system of a planet

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.