Blue hour before sunrise: lava red and sky blue. (Photo: Tom Pfeiffer)
More on VolcanoDiscovery:
Divergent plate boundaries in oceans
: Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.
Etna's steam rings
: A collection of fantastic vortex rings ("smoke rings") we observed recently on Etna.
Do you know which is the biggest volcano in the world?
Definition of a volcano
: A volcano is the term for any place on the surface of the earth, where hot molten rock (magma) reaches the surface.