Sea floor spreading is a process originating the mid-ocean ridges that results from volcanic activity. This volcanic activity piles on new rock expanding the crust. the debris begins to the spread further from the ridge as the activity continues.
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The Groins are hard structures and used to maintain uplift beaches as to restrict longshore sediment transportation form tasking place. Are meant to capture sand transportation by the currents.
While the jetty is another type of shore perpendicular structure that is placed adjacent to the tidal inlets and controls the inlet migration. Both of them are used to destabilize coastal systems and disrupt the natural sediment regimes.
