Continental plates move when olivine from upper mantle comes through basalt crack {rift}|, pushing plates apart. Pushed plates move one inch per year. Atlantic-Ocean middle has rift north to south that rises above sea level at Iceland, Azores, and Ascension Islands. Southeast South Pacific Ocean and central Indian Ocean have rifts.
Physical Sciences>Earth Science>Planet>Plate Tectonics>Rift
5-Earth Science-Planet-Plate Tectonics-Rift
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224