Top 10 vol­ca­noes facts

In Naples. Lying mostly underwater, Campi Flegrei comprises 24 craters. It is one of the largest volcanoes in the world, capable of producing VEI 7 (super-colossal) eruptions. Its most recent eruption of 1538 created a new hill, Monte Nuovo.

Ol Doinyo Lengai is an active volcano located in Tanzania. It uniquely produces natrocarbonatite lava. Due to this unusual composition, the lava is erupted at relatively low temperatures (approx. 500-600 °C). This temperature is so low that the molten lava appears black in sunlight, rather than having the red glow common to most lavas.

Degassing of magma. The whole process begins when hot magma is lifted by convection to the magma chamber. As the pressure in the chamber is lower than deep in Earth's crust, the gas starts to release. Since degassed magma has lower density, it may then sink and be replaced with new one. This process may build up huge pressure of gases, eventually causing explosion.

Australia. There are no active volcanoes on the Australian mainland that have erupted since European settlement, however, some volcanoes in Victoria and South Australia are likely to have been active and witnessed by Aboriginal people several thousand years ago.

On Mars. Olympus Mons (Latin for Mount Olympus) is a large shield volcano on the planet Mars, having a height of nearly 22 km (14 mi). Being a shield volcano, it has a very low profile. The average slope on the volcano's flanks is only 5°. Because of that, an observer standing on the Martian surface would be unable to view the entire profile of the volcano, even from a great distance.

Russia. Two characteristic peaks of Mt Elbrus have two volcano craters. The eastern peak has an enormous crater 250m in diameter.

Spain. Mount Teide is a volcano on Tenerife in the Canary Islands, Spain. Its 3,718-metre (12,198 ft) summit is the highest point in Spain and the highest point above sea level in the islands of the Atlantic.

was flooded with lava. Green Lake with a surface area of 0.8 hectares and a maximum depth of 6 metres, it was the largest natural freshwater lake in the Hawaiian Islands. On June 2, 2018, the lake was destroyed when lava flows from Kīlauea's lower Puna eruption boiled it away and completely filled the entire basin

Ojos del Salado. Nevado Ojos del Salado is a stratovolcano in the Andes on the Argentina–Chile border and the highest active volcano in the world at 6,893 m (22,615 ft).[3] It is also the second highest mountain in the Western Hemisphere and Southern Hemisphere and the highest in Chile.

Stromboli. Mt Stromboli has been in almost one continuous eruption for the past 2000 years, which is the longest known in the world. The volcano explodes at intervals ranging from minutes to hours. This is known as Strombolian eruption type, also observed at other volcanoes worldwide.