Question

[120]. Read the following passage carefully and answer the question.

Passage: An earthquake begins far underground, where huge blocks of rock, pressed together for years, suddenly slip along a fault and release stored energy as seismic waves. The point of slip is the focus; the point on the surface above it is the epicentre, where shaking is often strongest. Scientists measure earthquakes with seismographs and describe their size by magnitude and their effects by intensity, two scales that are often confused. Buildings, not the shaking alone, cause most deaths, which is why earthquake-resistant design, firm foundations and safe open spaces matter more than prediction, which remains unreliable. Understanding earthquakes therefore means accepting that the ground we trust is slowly moving, and building as if it might move suddenly. In the context of the passage, the word 'fault' most nearly means: