What is an earthquake?

Where do the majority of Earthquakes occur?

As rocks settle into their new positions, there will be lots of smaller earthquakes after the big one called?...

What is the highest number on the Richter scale?

What machine is an earthquake measured by?

What city in Japan did an earthquake take place there in 1995?

How many people were killed in the Kobe earthquake?

How can the danger of an earthquake be reduced? What is put in place?