EXTRUSIVE VULCANICITY: This is the solidification of molten magma directly on the surface of the earth crust to form distinctive features like composite Cones, Cinder Cones, Lava Cones or Shield Volcanoes, Lava Dome and Calderas.
INTRUSIVE VULCANICITY: This is the solidification of molten magma within the crust which forms various features like Dykes, Siulls, Laccoliths, Lopolith, Phacolith, Batholith, Volcanic necks and Dike ridges.
VULCANICITY OR VULCANISM: This is all the processes by which, gaseous materials/molten magma beneath the earth, forces its way into the cracks of the earth’s crust and escapes through fissures onto the surface of the earth. Volcaism is associated with areas where mountain building has taken place. There are two kinds of volcanism namely intrusive …
Volcanoes are hills or mountains that are formed when hot molten rock called lava, from inside the earth pushes up through the earth’s crust. Gases produce volcanic eruption.