Volcanoes

• Basaltic – lava/rock, fluid and flows easily 
• Lava - Molten rock erupted at the surface  
• Magma - Underground molten rock 
• Liquid lava that flows out of the vent or crack 
• As volcanic bombs- lumps of molten rock that solidify as they explode out of the vent and fall to Earth 
• An active volcano is erupting or has erupted recently and is likely to erupt again 
• A dormant volcano is one that has not erupted for 10,000 years but could become active again 
• An extinct volcanoes hasn’t erupted for the last million years and will probably never erupt again 
• Shield Volcano - A volcano with gentle slopes. They form from runny lava which spreads from its source 
• Composite or Stratovolcano - Tall volcanoes with steep sides and a symmetrical cone shape, they form from very thick, viscous or sticky lava that won’t flow easily so the lava builds up around the vent 
• Secondary cone – sometimes the main vent of the volcano, can be blocked so magma can find a way out of the volcano from the side 
• Ash cloud – a large cloud of smoke and dust that forms over a volcano