(۱) Oceanic and continental lithosphere
(2) Asthenosphere – denser semi-solid roc
(3) rock softens and partially melts and can flow very slowly
(4) convection currents bring hot material from deeper within the mantle
(7-10) the older part of the plate moves away from the ridge where it was originally created
(8) the plate gradually cools down, gets heavier and eventrually sinks
(9) into the asthenosphere into the
(10) subduction zone; Subduction zones are a type of
(11) convergent plate boundary; partial melting
(12)of the subducted basalt commonly produces magmas
(13) that are intermediate (dioritic) to felsic (granitic). partial melting also producesandesitic and rhyolitic eruptions
(۱۴). (Mount SaintHelen’s in Washington state is an andesitic volcano.)
(2) Asthenosphere – denser semi-solid roc
(3) rock softens and partially melts and can flow very slowly
(4) convection currents bring hot material from deeper within the mantle
divergent plate boundary – mafic (basaltic) magmas from the asthenosphere commonly erupt onto the seafloor along mid-ocean ridgesand above isolated hot spots such as the Hawaiian Islands; basaltic eruptions at mid-ocean ridges 5
(6) gradually force the older basalt rock to move laterally until subsides into trenches beneath the continents.(7-10) the older part of the plate moves away from the ridge where it was originally created
(8) the plate gradually cools down, gets heavier and eventrually sinks
(9) into the asthenosphere into the
(10) subduction zone; Subduction zones are a type of
(11) convergent plate boundary; partial melting
(12)of the subducted basalt commonly produces magmas
(13) that are intermediate (dioritic) to felsic (granitic). partial melting also producesandesitic and rhyolitic eruptions
(۱۴). (Mount SaintHelen’s in Washington state is an andesitic volcano.)