How powerful are tsunamis?

Here is my final version of how powerful are tsunamis?

A tsunami is one the most powerful forces in the world. People, boats and entire villages can be tossed inland or swept out to sea. Tsunami waves can rip up forests and are strong enough to lift cars into trees and knock houses from their foundations.

The power of a tsunami wave depends on what caused it and how powerful the event was. For example an earthquake with a high reading on the Rictor Scale will produce a more powerful tsunami than an earthquake with low reading on the Rictor Scale.