Earthquakes originate close to the Earth's surface.

1. Why do you think earthquakes only originate near the surface?
2. At what depths do earthquakes originate?

Unusually deep earthquakes are associated with some of the Earth's volcanic mountain ranges.

1. What Earth process takes place where these unusually deep earthquakes occur?

Can earthquake waves pass through the inside of the Earth?

Do you think that earthquakes (planet quakes) occur on other planets?