How Golda Meir, Indira Gandhi, and Margaret Thatcher Wrought a New Standard of Leadership. It is surely time to recognize what an immense improvement has been wrought in world standards of governance by the rise of female national leaders.
Shield volcanoes, the third type of volcano, are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping cone of flat, domical shape, with a profile much like that of a warrior's shield.
Because with a higher viscosity magma, the dissolved gases cannot escape easily and pressure will build in the volcano until the volcano cannot contain the amount of pressure build-up. Compare and contrast the three main types of volcanoes (consider size, composition, shape, and eruptive style.) Shield Volcano. Largest in size, mafic (basaltic) magma composition with a lower silica content, looks like a warriors shield, not very explosive.