Marine biomes, also known as oceanic ecosystems, are home to a variety of living organisms and have different names based on their location and characteristics. For example, the "intertidal zone" is the area of the shoreline that is inundated during high tide and exposed during low tide, while "coral reefs" are underwater structures built by tiny animals called coral polyps. "Kelp forests" are found in colder waters and are defined by the presence of large brown algae, while "abyssal plains" are the deepest parts of the ocean and have unique geological and biological characteristics. Other synonyms for marine biomes include seagrass meadows, estuaries, and mangrove forests, each with its own distinct ecosystem.