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The properties and behaviour of volcanoes, from the genesis of magmas to their ascent and emission at the surface of the Earth (or other planetary environments).

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Why are all lower mantle plumes under oceans?

Having a look at the attached image (original at Wikipedia Hot Spot page) I noticed that all mantle plumes originating from lower mantle (in red) are under oceans. Why?
Leos Ondra's user avatar