Earthquakes occur most often at Under water Fractured ground Fault lines Mountain tops

## Step 1<br />The question is asking where earthquakes occur most frequently. The options provided are under water, fractured ground, fault lines, and mountain tops.<br /><br />## Step 2<br />Earthquakes are caused by the movement of the Earth's crust. This movement is most likely to occur at fault lines, which are fractures in the Earth's crust where two blocks of land have moved past each other.<br /><br />## Step 3<br />Fault lines are the most common places where earthquakes occur because they are the points where the Earth's crust is most likely to move. This movement can cause the ground to shake, which we feel as an earthquake.<br /><br />## Step 4<br />While earthquakes can also occur under water, on fractured ground, and on mountain tops, these are not the most common places for earthquakes to occur.