The high wall sea-waves caused by underwater earthquakes are called

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about high wall sea waves that are caused by underwater earthquakes. We need to identify the specific term used to describe these waves.

2. **Identifying the Phenomenon**: High wall sea waves are often associated with significant disturbances in water bodies, particularly oceans. One of the most notable causes of such disturbances is underwater earthquakes.

3. **Definition of the Term**: The specific term for high wall sea waves caused by underwater earthquakes is "tsunamis." Tsunamis are a series of waves generated in a water body due to the displacement of a large volume of water.

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