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| Pic: The print |
Earthquake
Vibration on earth
Cause: Tectonic activities and human activities can produce earthquake.
Terms:
a) Focus :point inside earth where earthquake generates.
b) Epicenter: point on earth surface vertically above focus.
Sismograph:Earthquakes measurement
Scale of measurement.
Richter: Earthquakes intensity
Mercelli: Based on intensity of destruction
Types of waves generated
P wave or longitudinal wave
S wave or transverse wave
L wave or surface waves.
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