EARTHQUAKE
An earthquake is one of the most terrifying natural phenomena. We generally think (1)______ the ground we stand on as solid and completely stable. An earthquake can shatter that idea instantly when we see the ground move and building fall (2)______. We only hear about earthquakes in the news every now and (3)______ but we are actually an everyday occurrence. In (4)_____, our planet experiences more than three million earthquakes a year. However, the vast majority of earthquakes are extremely weak, and some of the stronger earthquakes affect uninhabited places, (5)_____ they go largely unnoticed. It is only big earthquakes in densely populated areas that get our attention.
Until quite recently, nobody was sure what caused earthquakes. There is still a certain amount of mystery surrounding them today (6)_____we now have a much clearer understanding of the natural movements of rock beneath the surface of the earth that (7)_____ the ground above shake. Enormous progress (8)______ been made over the past century.
Seismologists have identified the forces that cause earthquakes, and developed technology, that can tell us (9)_______ size. They can even say where major earthquakes are likely to occur. Unfortunately, what they have (10)______ yet found is a way of predicting exactly when an earthquake
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