Volcanic mountains

• 1. Magma rises from a magma chamber in the earths crust through a vent. When the magma reaches the surface it is lava.
  2. Lava, hot ash and rocks are thrown into the air as the volcano erupts and an ash cloud is formed. There is a build up of material around the vent.
  3. As more eruptions occur, layer is added to layer until a cone shaped mountain is formed.
  4. the lava continues to flow from a crater at the top of the volcano
  5. e.g Mount St Helens, USA