Lava cooled in the cracks and fissures and forming perpendicular structures are called ________.

  
Which one of the following is a direct source of information about the interior of the earth?

 The ---------------- is the point on the Earth’s surface where the effects of an earthquake are most devastating.

 Name the scale used for measuring the magnitude of earthquake?

 Name the instrument which is used to record the earthquake waves reaching the surface

 Name the specific areas where the earthquake waves are not reported?

 Name the scale used for measuring the damage caused by the earthquake?

 Name the earthquakes which are generated due to sliding of rocks along a fault plane

 Which one of the following earthquake waves moves faster and are the first to arrive at the surface?

 Which types of volcanic eruptions have caused Deccan trap formations?