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At mid-ocean ridges, new crust is created by the injection, extrusion, and solidification of magma. After the magma has cooled through the Curie point , ferromagnetism becomes possible and the magnetization direction of magnetic minerals in the newly formed crust orients parallel to the current background geomagnetic field vector .
Plates that are not subducting are driven by gravity sliding off the elevated mid-ocean ridges a process called ridge push. [4] At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed. Hydrothermal vents are common at spreading centers. Older rocks will be found farther away from the ...
Drummond Matthews (left) and Frederick Vine, 1981. Drummond Hoyle Matthews FRS [1] (5 February 1931 – 20 July 1997), known as "Drum", [2] was a British marine geologist and geophysicist and a key contributor to the theory of plate tectonics.
Frederick John Vine FRS (17 June 1939 – 21 June 2024) was an English marine geologist and geophysicist.He made key contributions to the theory of plate tectonics, helping to show that the seafloor spreads from mid-ocean ridges with a symmetrical pattern of magnetic reversals in the basalt rocks on either side.
New research from the University of California, San Diego could solve a mystery that scientists have puzzled over for several years.
The seabed (also known as the seafloor, sea floor, ocean floor, and ocean bottom) is the bottom of the ocean. All floors of the ocean are known as 'seabeds'. The structure of the seabed of the global ocean is governed by plate tectonics. Most of the ocean is very deep, where the seabed is known as the abyssal plain. Seafloor spreading creates ...
Scientists believe they’ve discovered an ancient ocean floor comprising a new layer between Earth’s mantle and core.
Of the 71 percent of the Earth’s surface that is ocean floor, only 26 percent of it has been mapped with the level of resolution used on this expedition by the institute.