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Please can anybody answer the questions 11 12 and 13.

Hi,
 
An earthquake is a vibration or tremor produced in the Earth’s crust. It is caused by the disturbances originating deep inside the Earth’s crust.
 
Earthquakes can also be caused by the following:
  • Volcanic eruption
  • Meteors falling on the Earth’s surface
  • Underground explosions. For example, underground nuclear tests.
  • Collapsing structures such as mines etc.
Hope this helps,
Cheers !!

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ANSWER 12=EARTHQUAKE IS CAUSED DUE TO MOVEMENT OF TECTONIC PLATES BENEATH THE EARTH SURFACE AND DUE TO PRESSURE .
 ANSWER 13=IT IS ALSO CAUSED DUE TO SLIDING,SPREADING,COLLIDING AND DIVING OF TECTONIC PLATES.
EARTHQUAKE ARE ALSO CAUSED DUE TO HUMAN ACTIVITY AND VOLCANIC ACTIVITY LIKE NUCLEAR TESTED UNDER GROUND.
ANSWER 11=INNER STRUCTURE OF EARTH CONSISTS OF CRUST,MANTLE AND CORE.
I CAN'T DRAW THE DIAGRAM

HOPE QUESTION 12 AND 13 ARE CLEAR TO YOU
 
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