What causes earthquakes?
user
The world is constantly vibrating because of tectonic plates.  If a piece of the tectonic plate were to slip and break, it could cause a big earthquake.
assistant
Can they be predicted?
user
Not really.  Seismologists don’t understand everything about earthquakes yet, so it can still be difficult to predict when they might happen.
assistant
What causes earthquakes?
user
The world is constantly vibrating because of tectonic plates.  If a piece of the tectonic plate were to slip and break, it could cause a big earthquake.
assistant
Can they be predicted?
user
No, because they’re so unpredictable. But when tectonic plates move, it tends to cause a variety of smaller earthquakes. So scientists can know when something is about to happen by looking at a graph of earthquakes over time.
assistant
What causes earthquakes?