Extrusive igneous landforms are the result of magma coming from deep within the earth to the surface, where it cools as lava. This can happen explosively or slowly, depending on the chemical composition of the lava and whether there is an easy path for it to take to the surface. If there is not a pathway, pressure builds up over time (like a shaken soda) until the magma forcibly explodes outward.

Shield volcanoes- Volcanoes ranging in size from small to truly massive, created by steady, non-violent outpouring of lava. Mauna Loa and Mauna Kea in Hawaii are shield volcanoes rising nearly 9 km (5.6 mi) from the seafloor.
Stratovolcanoes- Also known as composite volcanoes, stratovolcanoes erupt both as flows and violently. Mount St. Helens and Mount Rainier are stratovolcanoes.
Cinder cones- Short, steep volcanoes associated with limited eruptive events. Sunset Crater Volcano and Capulin Volcano are cinder cones.
Lava Domes-Lava domes form where thick (viscous) magma erupts to the surface forming a steep dome-shaped landform. Lava domes can form within a crater of large composite volcano.
Maar-Diatreme Volcanoes-maar-diatreme volcanoes are formed by the explosive result of subsurface magma coming into contact with shallow ground water. The maar is the crater landform produced by explosive eruption(s) and the diatreme is the below surface rock filled volcanic pipe or conduit.