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lava from underwater volcanoes

Basaltic lava that rose from underwater shield cone or shield volcanoes. When this lava cooled it formed igneous rock.

The chain nature is caused by the factors of hot spots in the Earth's crust and the concepts of plate tectonics and the continental drift. The variation in island size relates to the time taken for the plate as it crossed over the hot spot, the strength of the hot spot at that time, and the amount of erosion that has occurred since its formation. (Please note these time periods span over a considerable number of years in the thousands, maybe millions)

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13y ago

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