Flank craters can form at lower altitudes than summit craters, near hillside towns.Lava, gas, rocks, and other material ejected from a flank crater can rush down the side of a mountain in a phenomenon called a pyroclastic flow.What are the definition of the characteristics of a volcanic mountain?Eruption: Occurs when a volcanic mountain becomes active and eject lava, ashes and chemical gases.Explosion: Occurs when a volcanic mountain explodes with thrusts of rocks, fractured stratoplates, molten magma, and bombs producing extreme heats, red hot lava with a mixture of hot water, thick smoke forming combustion of mixed clouds, debris and ash bursting into the atmosphere.Expansion: Occurs when a volcanic mountain expands due to molten magma, divided stratoplates, extreme heat, debris causing cooling of rushing lava to form solidified magmalike, expanding land surface of the mountain.
Eruptions from flank craters can be much more dangerous than eruptions from summit craters.
Over a long period of time, small and non-explosive eruptions may fill a volcanic crater with new material. Volcanoes can also create craters when the magma comes into contact with water.
Magma flowing or bubbling beneath a volcano can sometimes interact with groundwater in the area.
Uplift or Inflation: Occurs when a mass of new lava rises to the surface, it pushes the old rock aside and upward making a bulge or uplift on the surface.
The process is often called inflation, because the expansion of a volcano due to the lava pushing up inside is similar to inflating a balloon by blowing new air into it.