21.   A. When you want to know how large an earthquake is, the first thing that comes to mind is the Richter scale.

22.   After the blizzards, will there be an earthquake?

23.   But so far, there has been no earthquake.

24.   But why anyone would need a siren to tell them that there had been an earthquake is an open question.

25.   Compared to the Bengals, the Northridge earthquake was a joy to behold.

26.   Could this be a sign that a major earthquake was about to occur?

27.   Earthquakes have long been central to the consciousness of the Japanese people, who live on a series of seismic fault lines.

28.   Earthquakes often are much deeper below the surface.

29.   Earthquakes are a classic example of a chaotic system, he said.

30.   Earthquakes were not the only thing upsetting Jones on Wednesday.