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| rdfs:label | - What are mid ocean ridges and how do they form
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| rdfs:comment | - Mid ocean ridges are where new oceanic crust forms. Mantle passively upwells, and partially melts due to reduction of pressure on it. The melt migrates upwards (because it's lighter than the solid around it), and freezes to make new ocean crust. The ridge pulls apart due to two forces. 'Ridge push', because the ridges are higher than the older ocean crust (because they're hotter and thus less dense). And 'slab pull', from sinking subducting slabs. Not all oceans have subduction zones - the pacific and indian do, but not the atlantic.
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| dcterms:subject | |
| abstract | - Mid ocean ridges are where new oceanic crust forms. Mantle passively upwells, and partially melts due to reduction of pressure on it. The melt migrates upwards (because it's lighter than the solid around it), and freezes to make new ocean crust. The ridge pulls apart due to two forces. 'Ridge push', because the ridges are higher than the older ocean crust (because they're hotter and thus less dense). And 'slab pull', from sinking subducting slabs. Not all oceans have subduction zones - the pacific and indian do, but not the atlantic.
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