Bernoulli's Principle in volcanoes

Volcanos relate to Bernoulli's Principle. When pressure builds up inside the volcano it erupts. Usually there is a layer in between the outside and the inside. Lava from the Earth's core builds up against the layer which builds up a lot of pressure. When it breaks through it rushes through very quickly. Bernoulli's Principle is like when you put your thumb on the end of a hose and the water goes farther and faster. You would think the water would go slower but it doesn't. Another example is saw you were trapped in a small room with a lot of people. I lock the door and start to turn up the heat. You would probably be very desperate to get out so when the smallest gap appears everyone would rush to it to get out. Or they would try to break down the door like the lava.