Because light travels more than 800 thousand times as fast as sound does.
Because one might have other minerals in it as well
I really do not understand this but i hope you find it
They have less-runny lava, meaning that it doesn't travel as far before cooling, meaning that the layers build up more steeply, but don't go out as far. You also get layers of ash on the composite volcano to help build it up too
Increase i believe that is the awnser
