LREE
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Tristao Da Cunha , ocean-island basalt (OIB) Quartz tholeiites, alkali basalts, and nephelinites found on volcanoes which build up from the ocean floor to form the ocea… Crust , Crust
Earth's mass is divided into an inner core, outer core, mantle, and crust. The crust is outermost layer of the earth, 3–44 miles (5–70 km) thic… Mid-ocean Ridge , Mid-Ocean Ridges
The mid-ocean ridge is an interconnected system of undersea volcanoes that meander over the Earth like the raised seams on a basebal… Ocean , Oceans are large bodies of salt water that surround Earth's continents and occupy the basins between them. The four major oceans of the world are the… Rare-earth Metals , rare-earth metals
rare-earth metals
rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series and… Seafloor Spreading , seafloor spreading, theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. First propos…