Several people wanted to know why this earthquake produced a tsunami when most earthquakes do not. To understand that, we need to know about faults. Before you start listing all my faults, such as forgetting to include parts of the experiment, I am talking about geologic faults.
Anytime there is an earthquake, the news media makes a big point of talking about the Richter Scale, using it to indicate how bad the earthquake was. As we will see, the Richter Scale does not tell us nearly as much about surface effects as people think it does.
Children are natural scientists -- curious about the world around them and more than willing to explore. Encourage your child to learn more by offering them the basic science skills of observing, predicting and evaluating their subject.