That's were the Earth's crust is pulling apart - and the gap is being filled with molton lava.
it is estimate if 25-20 because of it's relatively high ranges
Granitic crust does not form at the mid-oceanic ridge. Rather another type of igneous rock Basalt is formed at the Mid-Oceanic ridge. Both are silicate rocks and have a high oxygen and silica content. The difference is that Granite is formed intrusively, that is within the Earth's crust. Basalt is extrusive, that is it is formed above the Earth's surface, such as at the bottom of the ocean at the Mid-Oceanic ridge.
Because the oceanic ridge consists of very dense rocks having high specific gravity and with high melting point.
It doesn't have to be a high ridge, but in any event, it is the 'Continental Divide'.
>.<
The ridge creates negative curvature vorticity which is conducive to the development of high pressure just downstream. This anticyclone then transports air meridionally around the return flow.
It is heat transfer at speed higher than 0.3 Mach.
Heat effects the flow rate of lava because the hotter the lava is, the less viscous it is which allows it to flow faster than if it had a slow flow rate. If it has a low temperature, then the flow rate will be much slower because it has a high viscosity.
Ridge High School was created in 1961.
The heat flow is high on the lithosphere/sea for, creating ideal circumstances for the plates to move easier, hence plate tectonics.
Divergent.
high