Extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside the LOCATION@1 flows out -LRB- extrudes -RRB- onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff .

Extrusive means to the mode of igneous volcanic rock formation in which hot magma from inside the LOCATION@1 flows out -LRB- extrudes -RRB- onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff .
