- The tide is when ocean levels periodically rise / fall
- The gravitational pull of the moon on earth 's oceans causes the tides
- Therefore, the gravitational pull causes the ocean levels on earth to rise and fall periodically

Therefore, the gravitational pull causes the ocean levels on earth to rise and fall periodically
[Question]Which of the following is the major cause of tides?
[Context]- The tide is when ocean levels periodically rise / fall 
- The gravitational pull of the moon on earth 's oceans causes the tides