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.
overturn. 1  to destroy the power of; overthrow; defeat; vanquish. 2  to turn over on its side, face, or back; upset: to overturn a vase. 3  to turn on its side, face, or back; capsize: The boat overturned during the storm. 4  the act of overturning. 5  the state of being overturned.