The periodic rise and fall of water in seas and oceans due to moon's gravitational pull are known as _________.

Explanation

To solve the question regarding the periodic rise and fall of water in seas and oceans due to the moon's gravitational pull, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept**: The question is asking about a natural phenomenon that occurs in the seas and oceans. This phenomenon is influenced by the gravitational pull of the moon.

2. **Identify the Phenomenon**: The periodic rise and fall of water levels in the oceans is a well-known occurrence. It is essential to recognize that this is not just a random event but a regular pattern that happens due to specific forces.

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