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INTRODUCTION- definition of earthquake,
• Causes
• instrument & unit used
• effect
CASE STUDY : Earthquake in the Indian ocean in 2004
Role of a student during such natural calamity.


Defination-an earthquake is a shaking of the ground caused by the sudden breaking and movement of large sections (tectonic plates ) of the earth's rocky outermost crust .
causes-most earthquake occurs along the fault lines when the plates slide past each other or collide against each other.
instrument-ritcher scale
effect-can cause great damages like breking of buildings, monument ,etc.
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