Multiple choice

If storm clouds build positive charges up top, and negative at the bottom, what could occur?

  1. rain

  2. hail

  3. fog

  4. lightning

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a large potential difference exists between the top and bottom of a cloud, or between the cloud and the ground, the air can become ionized, leading to a discharge of electricity known as lightning.