Correct Answer: tide

Solution : The correct answer is tide .

The rhythmic rise and fall of ocean water twice a day, caused by the gravitational pull of the moon and the sun on Earth, is called a tidal cycle . This natural phenomenon is known as tides . Tides occur due to the gravitational forces exerted by celestial bodies on Earth's water bodies, causing periodic variations in sea levels. This tidal movement is crucial for marine ecosystems and influences coastal environments.