gravity - attractive force that exists between all objects, high tide - highest level of water on the shore; it occurs twice daily in most coastal areas, low tide - lowest level of water on the shore; it occurs twice daily in most coastal areas, neap tide - occurs during the first and third quarter moon phases when there is the least difference between high and low tides;, spring tide - occurs during the new and full moon phases when there is greatest difference between high and low tides;, tidal bulge - Movement of Earth’s ocean waters to the sides of Earth facing toward and away from the Moon, tide - the rise and fall of seawater twice daily on the most coasts,

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