Differences between quiet and loud volcano eruptions:
Volcanic eruptions are a subtle way of expelling gases, lava, magma to the surface. The composition and pressure created during the expulsion of magma decides whether it is quiet or loud. 
Quiet volcano eruptions
- The quiet eruptions are generally termed as Effusive volcanoes.
 - Quiet eruptions the lava just oozes out quietly.
 - Quiet volcano is not dangerous. 
 
Loud volcano eruptions
- The loud ones are called as Explosive volcanoes. 
 - In loud volcano the gas bubbles that is furious to expel in force comes out violently causing the loud sound. 
 - It is highly dangerous.