When this vibration reaches an ear, it is translated into what we recognize as a sound. Sound vibration must travel through matter. This is typically air. When you say, Hello, to a friend, the air parts (called molecules) vibrate in small waves which travel to the friend and they hear the word Hello..
Continental crust is actually much thicker than oceanic crust. This is because Continental crust has been formed over a much longer period of time, and especially so due to sea-floor spreading (as new crust is constantly produced).
Yes, that is the reason oceanic crust is at a lower elevation compared to continental crust. Oceanic crust sub-ducts under the less dense continental crust. Continental crust â¦ is much older than oceanic crust, because oceanic crust is constantly being destroyed and created.