The process that extends the ocean floor whenever there were movements within the two plates is called Sea-floor Spreading. This movement happens when a magma seeps out between the two plates, then it solidifies and extends the ocean floor. When there were movements, a long chain mountain is being created, and it is called Mid-Oceanic Range. It also results in the formation of a new oceanic crust. The new crust is from the magma within the mantle of the Earth.
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More about the Sea-floor spreading:
https://brainly.ph/question/206161
More about the Mid-Oceanic Range:
https://brainly.ph/question/753309