There are approximately 1,500 active terrestrial volcanoes, of which around 60 erupt every year. Volcanoes can be the source of gigantic climatic catastrophes, causing a sudden cooling of the average temperature of the Earth. A volcano is a relief of the earth's submarine or aerial crust, formed by the ejection and stacking of materials resulting from the rise of a magma in the form of lava and tephra.
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Mauna Loa is the largest
volcano in the world! 
Effusive and eruptive volcanoes
of the Earth 
Kamchatka, exceptional land of
fire 
The threat of supervolcanoes 
The active volcanoes of
Colombia 
New Zealand volcanoes 
Volcanoes at the origin of life 
The great ocean trenches 
Birth of an island,
rising from the waters 
Chimborazo
in Ecuador, the highest mountain in the world 
Super eruption disaster 
The great calderas of the planet 
Africa's Active Volcanoes 
Supervolcanoes have changed life
on Earth 
The Nevado del Ruiz volcano
The Phlegraean Fields 
The Yellowstone Supervolcano 
The spectacular caldera of Lake Taupo