Calculate the pressure in a magma chamber at a depth of 2km. Assume the density of magma is 2650kg/m3 and gravitational field strength is 9.8N/kg.​

The correct answer is c. hope this

One splits the atoms and molecules  the other combines them

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.