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Volcanic extrusive rocks

Geological POI


Source: Pascal Brackman

Place where you can see a good example of volcanic extrusive rocks on Lemnos. You will notice smaller blocks of volcanic rocks 'floating' in a matrix of petrified lava and pyroclastics. Extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. This is as opposed to intrusive rock formation, in which magma does not reach the surface (of which you will also see man examples on Lemnos).

Source: Pascal Brackman



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