Why do volcanoes erupt only occasionally?

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There are all kinds of volcanoes all over the world, but how are they formed? And how do they erupt? To find out, we’ll travel to the center of the Earth, and we’ll meet a NASA robot that’s going on a very special volcano mission.

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Il existe de nombreux volcans de par le monde, dont beaucoup sont encore très actifs. Si l'on se fonde sur les types d'éruptions qu'ils provoquent, il en existe deux grandes catégories.

On trouve d'abord des volcans effusifs. Ils se caractérisent surtout par le compo ...

Just after Thanksgiving, for the first time in almost 40 years, Hawaii's Mauna Loa volcano erupted. It's one of several ongoing eruptions – including Kilauea, also on Hawaii, and Indonesia's Mount Semeru. At just over half the size of the big island of Hawaii, Mauna Loa is the wo ...  عرض المزيد

Which came first the volcano or the rain? Volcanic eruptions are known to influence global climate systems, even leading to the cooling of the planet. However local weather conditions can also influence the timing and ferocity of volcanic eruptions. As volcanologist Jenni Barclay ...  عرض المزيد