Volcanoes

• Volcano


  A vent in Earth's crust through which molten rocks flow
• Magma


  The molten rock beneath the Earth
• Lava


  The molten rock that are expelled out of the volcano
• Convergent boundaries


  Where two plates collide
• Divergent boundaries


  Where 2 plates spread apart
• Hot spots


  Volcanoes which are not associated with plate boundaries
• Ring of Fire


  An area of earthquake and volcanic activity that surrounds the Pacific Ocean
• Albay


  The province where Mayon Volcano is located
• Extinct


  Volcanoes that have not erupted for several centuries and are not expected to erupt again
• Active


  Volcanoes close to plate boundaries that have erupted within the last 100,000 years
• There are 23 active volcanoes in the Philippines
• Oceanic-oceanic convergent boundary


  Can lead to the creation of deep oceanic trenches and volcanic island arcs
• Continental-continental convergent boundary


  Causes significant bending, faulting and rising of the earth's crust resulting in the development of huge mountain ranges
• PHILVOCS


  The government agency that monitors and conducts studies on volcanoes and volcanic eruptions in the Philippines
• Shield volcanoes


  Large volcanoes with gentle slopes of basaltic lava common along divergent plate boundaries and oceanic hot spots
• Composite volcanoes


  Large, steep-sided volcanoes that result from explosive eruptions of andesitic and rhyolitic lava and ash along convergent plate boundaries
• Cinder cone volcanoes


  Small, steep-sided volcanoes that erupt gas-rich, basaltic lavas
• Composite volcano


  • Mayon Volcano
• Cinder cone volcano


  • Taal volcano
• Caldera


  A large volcanic depression formed when a volcano's summit collapses or is blown away by explosive activity