What is Tsunami? Explain.

Explanation

### Step-by-Step Solution:

1. **Definition of Tsunami**: A tsunami is a series of large ocean waves typically caused by underwater disturbances such as earthquakes, volcanic eruptions, or landslides. These waves can travel across entire ocean basins.

2. **Causes of Tsunami**: The primary cause of a tsunami is seismic activity, particularly earthquakes that occur on the ocean floor. When an earthquake happens, it displaces a large volume of water, generating powerful waves that can travel at high speeds.

3. **Impact on Coastal Areas**: When these waves reach coastal areas, they can become extremely large and destructive. Tsunami waves can rise to heights of 20 to 30 meters (approximately 65 to 100 feet), which is comparable to the height of a 3 to 4-story building.

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