Answer:
i think it is the last one.
Explanation:
hope i helped
Answer:
A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. It typically has a depth of about 2,600 meters (8,500 ft) and rises about 2,000 meters (6,600 ft) above the deepest portion of an ocean basin. This feature is where seafloor spreading takes place along a divergent plate boundary. The rate of seafloor spreading determines the morphology of the crest of the mid-ocean ridge and its width in an ocean basin. The production of new seafloor and oceanic lithosphere results from mantle upwelling in response to plate separation. The melt rises as magma at the linear weakness between the separating plates, and emerges as lava, creating new oceanic crust and lithosphere upon cooling. The first discovered mid-ocean ridge was the Mid-Atlantic Ridge, which is a spreading center that bisects the North and South Atlantic basins; hence the origin of the name 'mid-ocean ridge'. Most oceanic spreading centers are not in the middle of their hosting ocean basis but regardless, are traditionally called mid-ocean ridges. Mid-ocean ridges around the globe are linked by plate tectonic boundaries and the trace of the ridges across the ocean floor appears similar to the seam of a baseball. The mid-ocean ridge system thus is the longest mountain range on Earth, reaching about 65,000 km (40,000 mi).
Answer:
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Explanation:
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Answer:
None of the above
Explanation:
The Bowen reaction series provides an insight to what happens to a crystallizing magma as it cools. There are two arms in the series, the continuous and the discontinuous series. The continuous series is made of the plagioclase feldspar. At high temperature, calcic plagioclase are crystallized out of the melt and at lower temperature, sodic plagioclase begins to from.
The discontinuous series consists of the trend through which other minerals are crystallized. At high temperature, olivine first forms and quartz is the last to crystallized out.
For a given melt, according to the Bowen's reaction series, the composition becomes more felsic at low temperatures. The silica content increases considerably.
The series is designed for silicate minerals found in nature and not sulfate minerals. The continuous series is for plagioclase feldspars not amphibole. Amphibole is in the discontinuous series.
