How do tectonic movements contribute to the creation of new ocean habitats?

Tectonic movements significantly contribute to the creation of new ocean habitats primarily through the formation of reefs and underwater volcanoes. When tectonic plates shift, they can lead to the emergence of volcanic islands and the buildup of reefs as coral polyps colonize submerged structures. These reefs serve as rich ecosystems, providing shelter, food, and breeding grounds for a myriad of marine species. Over time, as these underwater features grow and evolve, they offer diverse habitats that support biodiversity and facilitate complex food webs in the ocean.

In contrast to this correct option, draining water from oceans does not contribute to habitat creation. Tsunamis, while they can alter landscapes, tend to be destructive rather than creating new habitats. Erosion of coastlines may modify existing habitats, but it does not create new ones in the sense that tectonic movements can through formation of new geological structures. Therefore, the formation of reefs and underwater volcanoes is essential in expanding and enhancing marine ecosystems, making it the accurate answer.