Coastlines can convert back and forth among various coastal environments due to plate tectonic processes which can cause the land to rise/sink and sea level to increase/decrease: True.
due to convergence of plate various landforms are formed such as Oceanic tench, fold mountains, volcanoes, etc .
due to divergence of plate boundaries multiple landforms are formed such as volcanoes , mid oceanic ridge , faulting, etc
due to folding and faulting nature, land gets rise or sink.
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