earthquakes
What makes a tsunami — and what to do if one comes
Several factors help determine whether a given earthquake will generate a dangerous tsunami, but the process is not yet fully understood.
When an earthquake struck San Diego, these elephants formed an ‘alert circle’
When a 5.2 earthquake hit near San Diego yesterday, the San Diego Zoo Safari Park caught its elephants on video taking action to protect their young, forming what experts call an "alert circle."
