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The Indian Ocean is the third-largest of the world’s five oceanic divisions, covering 70,560,000 km2 (27,240,000 sq mi) or approximately 20% of the water area of Earth’s surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded…
The Southeast Indian Ridge (SEIR) is the spreading centre closest to the Kerguelen and Amsterdam–Saint-Paul hotspots. The SEIR has an intermediate full spreading rate of 65 mm/a (2.6 in/year), and, because Antarctica is virtually stationary, this results in a northward ridge migration of half that rate. Spreading rates along the…