Earthquake is the shaking of the Earth crust that occurs naturally or by human activities. This is also part of the geological processes that result to the formation of oceans, valleys, mountains, and plains. Over the last 100 years, scientists have learned a great deal about these processes, causes, measures, and occurrences of an ____ ____ of energy travel through the Earth are called seismic waves. Tremendous ____ is released causing the ground to move and shake. The body waves are seismic waves that travel through the interior of the Earth. These waves are of higher ____ than surface waves. ____ travel only through the crust. These are of lower frequency than body waves, and are easily distinguished on a seismograph.

Earthquakes

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