Tsunamis are giant, fast‑moving waves capable of destroying entire coastlines. This engaging hi‑lo book explains how underwater earthquakes, volcanoes, and landslides trigger tsunamis and why these waves travel so far and hit land with such force. Readers explore warning signs, flood zones, and the damage tsunamis cause to buildings and the environment. The book also shows how scientists use sensors, buoys, satellites, and seafloor robots to detect tsunamis and warn people in danger. Clear text, dramatic visuals, and critical‑thinking questions help developing teen readers understand these powerful natural disasters.