What causes a volcanic eruption to occur?
Since the magma is always building up pressure and the earth is always spinning, it sometimes causes a crack in the earth. The two sides of the crack may shift. This is called plate tectonics, known to be the cause of volcanic eruptions. The magma will burst through the crack. When magma comes out or erupts, it is called lava. If this crack is in the ocean, an island can be created. After it erupts numerous times, a cone is created. When there is an eruption in a volcano, the place where pressure builds up and where the magma is is called the magma chamber.
Is a cauldron like volcanic feature usually formed by the collapse of land following a volcanic eruption?
Volcanic eruptions are so deadly is that there is no way to predict where an eruption will occur in the near future?
A lahar is a volcanic mudflow that can be initiated in a few ways. In some cases an eruption can melt the snow pack on top of a volcano. This then mixes with ash both from the eruption and previously deposited, forming a mass of flowing mud. At other times muflows can occur when heavy rain falls on volcanic ash. Other mudflows can be initiated by landslides on volcanoes, especially where acid from volcanic gasses…