Along the Juan de Fuca Ridge, more than a mile and a half below the surface of the Pacific Ocean, molten magma from the Earth's mantle wells up, pushing the Pacific plate apart from the Juan de Fuca
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/20000-leagues-under-sea
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/economist-london
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/geology