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.
Dacite rocks Dacite contains less quartz than rhyolite lava and more than andesite lava. The lava when it flows out a a volcano vent is so sticky that it piles on top of a volcano's vent forming a dome. Lava domes often form in the craters of stratovolcanoes like Mount Saint Helens. The lava also forms small volcanoes with rough crumbly surfaces.