Deep Ocean Topography. Mid-Ocean Ridges and Hydrothermal Vents Sarah Fawcett. Mid-Ocean Ridges. Linear mountain chains. Some of the largest features on Earth. 5km-2.6km deep. Roughly symmetrical in cross section. Thousands of kilometers wide.
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and Hydrothermal Vents
Slow - 10mm/yr (Southwest Indian Ridge)
Fast - up to 160mm/yr (East Pacific Rise)
Correlation between global spreading rates and transgression of ocean waters onto the continents.
Early Cretaceous - Global spreading rates uniformly high
Marine sedimentsSeafloor Spreading