Can someone describe how sea-floor spreading causes mid-ocean ridges?

this is for my homework and i really don't understand it at all and it's a research paper so i don't have a book on it and the rest of the internet is not helping very much. so please help me.Can someone describe how sea-floor spreading causes mid-ocean ridges?
Sea floor spreading is caused primarily by a combination of subduction-related pull, and by convective forces in the upper mantle. As the plates move away from one another in the mid oceanic regions, linear zones of tension are developed. These zones take the form of long, linear rift zones, where the central portion of the rift sinks and is intruded by upwelling magma from the relatively shallow mantle.





The magma which is intruded and extruded into the rift zone builds up a rim of igneous rock which forms the mid ocean ridge. As the plates continue to move away from the ridge the plates isostatically readjust and the ridge material which has moved from the spreading centre sinks slightly into the mantle, and is no longer ridge-like. The process continues, with more magma erupted at the plate boundary to build up a ridge.





Hope this helps!Can someone describe how sea-floor spreading causes mid-ocean ridges?
Mid ocean ridges are the result of sea floor spreading, not the other way around. Magma is carried from the the convection of heat up from the mantle to the surface/crust central trench of a mid-ocean ridge, where the magma solidifies into new basaltic ocean/sea-floor. The lateral (to the ede) movement of the heat convection cells moves the the new sea floor to the side of the central trench. Upwelling magma creates volcanoes on the sea-floor, just like it does land, although the subduction is what produces most Island arc and continental vulcanism, not sea-floor spreading.
AS the sea floor spreads ( plate tectonics) the seafloor becomes thin or forms a valley, magma can fill these valleys to form new ocean ridges. See website-google ocean ridges





Mid-ocean ridge - Wikipedia, the free encyclopedia


A mid-ocean ridge demarcates the boundary between two tectonic plates, and ... Mid-ocean ridges are geologically active, with new magma constantly emerging onto the ...


en.wikipedia.org/wiki/Mid-ocean_ridge