Volcanoes that have not erupted for decades or centuries may cause the greatest volcanic threat to people and their surrounding areas.
Dormant Volcano
Molten rock below the surface of the Earth that rises in volcanic vents.
Magma
The simplest, most common type of volcano. It is built almost entirely of loose fragments called cinders and has a narrow base and a very steep slope.
Cinder Cone Volcano
The very hot, very dense center of our planet.
Core
An opening in the earth's crust through which lava, volcanic ash, and gases escape.
Volcano
Are huge, gently sloped volcanoes that almost exclusively erupts basaltic lava and include some of the largest volcanoes in the world.
Shield Volcano
Some of the most powerful and destructive volcanoes in human history. Are composed of alternating layers of lava and cinders.
Composite Volcano or Stratovolcano
It has no record of volcanic eruptions in the past thousand years.
Extinct Volcano
A volcano is considered active if it is currently erupting or showing regular signs of activity like earthquake activities and significant gas emissions.
Active Volcano
A molten rock emerging as a liquid onto Earth's surface.
Lava