At mid-oceanic ridges, plates are pulled apart in two separate directions. This creates a gap (rift valley), allowing for warm, buoyant magma to rise to the surface and cool. As the magma cools, it creates ridges along the rift valleys. The elevation is caused by the excess amount of newly created, less dense oceanic crust. This crust occupies more volume, which causes it to be higher up than the surrounding, older crust.
Seafloor spreading. This process includes the splitting of oceanic crust, pushing it aside and building new crust in the middle by magmatic activity.
I think just a oceanic ridges
Along the mid oceanic ridges (sites of crustal generation)
No. Mid oceanic ridges are the places where new oceanic crust are forming.
Oceanic lithosphere is always formed at active mid-ocean ridges and rises.
mountainous topography
When oceanic and oceanic plates diverge it creates mid ocean ridges!
New oceanic crust is created at the mid-oceanic ridges, a divergent plate boundary.
Spreading ridges
At spreading centers.
Generally, magmatic material rises through sea floor ridges to form new crust in the oceans. A small amount is released through volcanic activity.
New oceanic crust is created at the mid-oceanic ridges, a divergent plate boundary.