Earthquakes are due to the breaking of rock
at depth. Although the Earth does not seem to
move, in fact there are forces acting on rocks and
these forces are called stresses. When
the stress at some location exceeds the
strength of the material rock, the rock fractures
and THAT is an earthquake.
And earthquake is caused when pieces of the
earth suddenly move, and they jerk the earth.
Earthquakes are most common along tectonic plate
boundaries, and at faults. For example, at the San
Andreas fault, one side of the earth is moving in
a different direction than the other. If a big
amount of movement happens, one side jerks past
the other and the ground shakes with the movement.
Geologists and Geophysicists are the
scientists who study earthquakes and they track
how much movement occurs every year.
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