The correct answer is Are long, low waves out in the ocean that pile up near shore because such waves, or parts of such waves, move slower in shallower water.
Step-by-step explanation:
A tsunami is a natural disaster in which waves flood the land. This phenomenon is often caused by eruptions or earthquakes in the ocean. Moreover, as a tsunami starts waves increase their longitude, indeed the longitude of waves in a tsunami can be as long as 100 kilometers. Additionally, once waves reach shallow water near the coast these increase their speed due to the friction of the seafloor, and at this point, waves pile up to form waves up to 30 meters and this causes the flood on the land and the destruction of structures. According to this, tsunamis "Are long, low waves out in the ocean that pile up near shore because such waves, or parts of such waves, move slower in shallower water."