What is the primary reason why the Moon was not able to retain an atmosphere? High surface temperature and low gravitational attraction Low gravitational attraction and lack of volcanic activity Lack of volcanic activity and rapid rotation period Rapid rotation period and high surface temperature Low gravitational attraction and too much volcanic activity

## Step 1<br />The Moon's inability to retain an atmosphere is primarily due to two factors: its low gravitational attraction and the lack of volcanic activity.<br /><br />## Step 2<br />The Moon's gravitational pull is only one-sixth of Earth's. This is not strong enough to hold an atmosphere. <br /><br />## Step 3<br />The Moon also lacks significant volcanic activity. This means there are no processes to replenish an atmosphere that could be lost due to its low gravity.<br /><br />## Step 4<br />The other options provided, such as high surface temperature, rapid rotation period, and too much volcanic activity, are not the primary reasons for the Moon's inability to retain an atmosphere.