Question

the periodic rise and fall of the level of water in the ocean caused by the moons gravity * 2 points tide solstice ellipse maria

Explanation:

• Tide: Tides are the periodic rise and fall of ocean water levels caused by the gravitational pull of the Moon (and to a lesser extent, the Sun).
• Solstice: A solstice is an astronomical event that marks the longest or shortest day of the year, related to the tilt of the Earth's axis and its orbit around the Sun, not ocean water levels.
• Ellipse: An ellipse is a geometric shape (a type of conic section), not related to ocean - water - level changes.
• Maria: Maria (singular: mare) are large, dark, basaltic plains on the Moon, not related to ocean tides.

Answer:

tide