spreading plate
51Ophiolite — Ordovician ophiolite in Gros Morne National Park, Newfoundland. An ophiolite (  / …
52Oceanic crust — Age of oceanic crust. The red is most recent, and blue is the oldest. Oceanic crust is the part of Earth s lithosphere that surfaces in the ocean basins. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and… …
53Iceland plume — The Iceland Plume is an upwelling of anomalously hot rock in the Earth s mantle beneath Iceland whose origin probably lies at the boundary between the core and the mantle at ca. 2880 km depth. It is generally thought to be the cause of the… …
54Atlantic Ocean — an ocean bounded by North America and South America in the Western Hemisphere and by Europe and Africa in the Eastern Hemisphere. ab. 31,530,000 sq. mi. (81,663,000 sq. km); with connecting seas ab. 41,000,000 sq. mi. (106,100,000 sq. km);… …
55Explorer Ridge — The Explorer Ridge is a mid ocean ridge, a divergent tectonic plate boundary located about Unit km|241|0 west of Vancouver Island, British Columbia, Canada. It lies at the northern extremity of the Pacific spreading axis. To its east is the… …
56India — /in dee euh/, n. 1. Hindi, Bharat. a republic in S Asia: a union comprising 25 states and 7 union territories; formerly a British colony; gained independence Aug. 15, 1947; became a republic within the Commonwealth of Nations Jan. 26, 1950.… …
57Mid-Atlantic Ridge — The location of the Mid Atlantic Ridge The ridge was central in the breakup of Pangaea that began some 180 million years ago …
58Tanya Atwater — is an American geophysicist and marine geologist who specializes in plate tectonics, in particular the evolution of the San Andreas fault plate boundary. Her educational work has focused on the creation of computer animated multimedia products… …
59Ordovician Period — Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian. During the Ordovician, many of the landmasses were aligned in the tropics. Life was dominated… …
60Deccan Traps — The Deccan Traps as seen from Matheran, MH, India The …
