This for Earth/Space Science B-CR Which statement describes one aspect of an earthquake’s magnitude?
It is measured by the Mercalli scale.
It is based on the size of seismic waves.
It is not usually affected by the amount of fault movement.
It is used to determine damage caused by earthquakes.
THE ANWER IS :B THE SEC ONE

It is based on the size of seismic waves

Explanation:

Generally, the size of an earthquake is called its magnitude.

Earthquake’s magnitude is defined as the measure of the amplitude of the seismic waves. A seismometer or seismographs are used to measure seismic waves. So, the statement describes one aspect of an earthquake’s magnitude is that Earthquake’s magnitude depends on the size of seismic waves.

Earthquake’s magnitude is measured by the Richter magnitude scale.

Hence, the correct answer is It is based on the size of seismic waves.