Question

what is the main cause for the occurrence of tide

Answer 1

Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996)

Answer 2

The main causes for the occurrence of tides is the gravitational attraction or the gravitational pull by the moon.

Also, the centrifugal force developed due to the rotation of the earth plays a role in influencing the tides.

But as a primary cause,as the moon revolves around the earth, it attracts the ocean waters, resulting in the occurrence of tides at the various hours of the day.