: Subduction creates some of the deepest parts of the ocean, including the Mariana Trench , which reaches depths of nearly 11 kilometers (7 miles).
: Most activity occurs at convergent boundaries , where a denser oceanic plate is pushed beneath a lighter continental or oceanic plate into the Earth's mantle. This process, called subduction, melts rock into magma , which then rises to the surface to form volcanic arcs. Ring of Fire
: Areas like the East Pacific Rise feature plates pulling apart, allowing magma to well up and create new oceanic crust through seafloor spreading. Key Geological Features : Subduction creates some of the deepest parts