Question

How moon exert gravitational force on sea

Answer 1

Gravity is also the cause of tides. The earth’s gravity keeps water on the planet’s surface. However, the moon is large enough and close enough that its gravitational force has a noticeable effect on large bodies of water on Earth. Water on Earth in the region directly beneath the moon is pulled by gravitational force toward the moon creating a bulge on the surface of the ocean. There is also a bulge on the opposite side of the earth, caused by the difference in the moon’s gravitational force across the earth. The ocean bulges on both the side of the earth facing the moon and the side opposite the moon are called tidal bulges. Earth’s land surface also bulges, as does the moon, although not to the same extent as the ocean.