Volcanoes can be formed by plumes of magma originating in this layer of the Earth below the crust
Hot 
spots are a common term for thermal plumes of magma welling up through the 
crust far from ... Composite cones (or stratovolcanoes) are made up of alternating 
layers of... [DOC] [TLE] Volcano - Wikipedia [PAR] A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that 
allows hot lava, volcanic ash, and gases to escape from a magma chamber 
below the surface.