What is an earthquake?

What is an earthquake?
An earthquake takes place when two blocks of earth suddenly slip past one another. The surface where they slip is called a fault place.
What causes earthquakes and where do they happen?the earth has four major layers the inner core,outer core,mantle and crust.
              An earthquake can sometimes have four shocks.These are smaller earthquakes that happen in the same place, before a larger earthquake takes place.
                The largest mainshock.Main shocks are always followed by aftershocks that occur in the same place. They can continue for weeks, months, or even years after the mainshock.

An earthquake is a disaster with two plates of earth rubbing against each other.

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