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.
1 Lava is molten rock expelled by a volcano during an eruption. 2  A lava flow is a (moving) outpouring of lava, which is created during a non-explosive effusive eruption. 3  When it has stopped moving, lava solidifies to form igneous rock.The composition of a lava determines its behavior more than the temperature of its eruption. The viscosity of lava is important because it determines how the lava will behave. Island-arc magmas are generated in metosomatically altered mantle.hen it has stopped moving, lava solidifies to form igneous rock. The composition of a lava determines its behavior more than the temperature of its eruption. The viscosity of lava is important because it determines how the lava will behave.