Fill in each blank with the correct word from the lesson.

1. _______ form in tall cumulonimbus clouds where collisions between ice crystals and droplets build up electric charge.
2. When this charge difference becomes large enough, an electrical discharge jumps between the cloud and the ground — _______.
3. The cloud top becomes positively charged and the _______ becomes negatively charged.
4. This extreme heating causes the air to expand explosively, creating a _______ wave that we hear as thunder.
5. The lightning bolt superheats the air around it to _______s of about thirty thousand degrees Celsius — five times hotter than the sun's surface.

Choose the best option for each question.

1. Why do we see lightning before we hear thunder?
   a) Lightning is bigger than thunderb) Light travels faster than soundc) Thunder comes from a different cloudd) Lightning is closer than thunder
2. Why should you NOT stand under a tree in a thunderstorm?
   a) Trees attract lightning as tall objectsb) Trees produce static electricityc) Trees block lightning rodsd) The leaves cause sparks
3. What causes the sound of thunder?
   a) Clouds collidingb) The lightning bolt hitting the groundc) Explosive expansion of air heated by lightningd) Water falling from clouds

Write T for True or F for False in the brackets.

1. Light travels faster than sound is one of the key concepts in the lesson on Thunderstorms and Lightning.
2. Lightning is bigger than thunder is the main topic of this lesson.
3. Trees attract lightning as tall objects is one of the key concepts in the lesson on Thunderstorms and Lightning.
4. Trees produce static electricity is the main topic of this lesson.

1. In your own words, explain what Thunderstorms and Lightning means.
2. List two things you learned from this lesson on Thunderstorms and Lightning.