Shield Volcanoes. A shield volcano is a type of volcano usually built almost entirely of fluid lava flows. They have very gentle slopes and are very developed horizontally. These are the classical Hawaii examples â steady flow and accummulation of lava leading to the shield-type formation.hield Volcanoes. A shield volcano is a type of volcano usually built almost entirely of fluid lava flows. They have very gentle slopes and are very developed horizontally. These are the classical Hawaii examples â steady flow and accummulation of lava leading to the shield-type formation.
Definition of OVERTURN. 1. : the act of overturning: the state of being overturned. 2. : the sinking of surface water and rise of bottom water in a lake or sea that results from changes in temperature that commonly occur in spring and fall.efinition of OVERTURN. 1. : the act of overturning: the state of being overturned. 2. : the sinking of surface water and rise of bottom water in a lake or sea that results from changes in temperature that commonly occur in spring and fall.
The act or process of overturning: the court's overturn of a ruling. 2. The state of having been overturned. 3. The periodic mixing or circulation of water in a lake or sea as a result of changing temperature of its layers.