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Essay on Earthquake
An earthquake happens when parts of earth’s surface liberate energy from earth’s crust which move against each other that causes cracks in the ground. The movement of the plates inside an earth causes the land to shake. Earthquakes occur when two tectonic plates that are grinding against each other causes rocks to explode.
The earthquake spreads out as a shock waves, or seismic waves, from the focus. The waves get weaker as they travel further away from the focus. The Focus is a place from where an earthquake starts.
Seismograph is a machine used by scientists to measure earthquakes. It has a pen, a roll of turning paper and a metal of weight. When earthquake occurs the roll of paper start turning and the weight of metal holds the pen firmly. Then the pen makes lines on the paper and this shows the measurement of an earthquake.
Sometimes an earthquake has foreshocks. These are smaller earthquakes that happen in the same place as the larger earthquake that follows. Scientists can’t tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called the mainshock. Mainshocks always have aftershocks that follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock. Depending on the size of
the mainshock, aftershocks can continue for weeks, months, and even years after the mainshock!