Question

What is an earthquake?How is its severity measured?Metion two precautions you will keep during earthquake.

Answer 1

When two tectonic plates under the earth come in contact with each or touch each other they make the earth shake due to this earthquake comes.
It is measured with the help of Richter scale.

Answer 2

The shaking of earth's surface  is known as earthquake.

it's severity is measured in Richter scale.

precautions-
 
1. we should always stay Indore until earthquake stops.

2.we should away from furniture and bookcases.  . 

hope u understand :):):)