• Volcanoes are common along convergent and divergent plate boundaries.
  • They are also found within lithospheric plates at hotspots.
  • Most people think of volcanoes as large, peaky cones.
  • But volcanoes can be large and broad, or tiny little cones.
  • Volcanoes erupt because mantle rock melts.
  • Magma can be created when temperature rises, pressure lowers, or water is added.
  • Scientists question whether a volcano that is not erupting will ever erupt again and then describe it as active, dormant, or extinct.
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