<h2>12km</h2>
<em><u>Explanation:</u></em>
1 cm = 4 km
3 cm = 4×3 km
= 12 km
<h2>follow me</h2>
Answer: Earthquake refers to the sudden shaking of the earth due to the release of energy by the seismic ways in the earth's interior. An earthquake of magnitude 2 is exactly ten times bigger, as well as about 31-33 times stronger than that of magnitude 1 .
Richter scale is used to measure magnitude of an earthquake, that means how much energy has been released due to the release of seismic waves.
