Answer: Rotation/tidal.
Step-by-step explanation:
The moon's gravitational pull on the Earth surface is the major cause of the rising and falling of ocean tides. The gravitational pull of the moon causes two(2) bulges of water on different oceans of the earth. When the water from the oceans face the moon, the gravitational pull is at its strongest but when the waters from the ocean are not facing the moon, the pull is at its weakest.
The effect of the moon's gravity on the earth causes predictable rise and fall in sea levels and this is known as tides. It distorts the ocean and causes tides. The water that is very close to the moon experiences the greatest pull and thus bulges outwards.