1. Lightning 2/11/14 To insert this slide into your presentation
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2. Bellwork What are the three ways to charge an object? Friction Contact
Induction

3. Video

4. Lightning Charge separation within the cloud
Positive charges at the top of the cloud
Negative charges at the bottom of the cloud
Clouds charge the ground by induction
Step Leaders – come from the cloud (many kilometers long)
Streamers – form from ground objects (only meters long)

5. Types of Lightning Intra-Cloud (~80%) Cloud to Ground (~20%)
Negative (18%)
Positive (2%)
Cloud to Cloud and Cloud to Air (rare)

7. Negative vs. Positive Lightning
Negative Lightning
Positive lightning

8. Negative and Cloud to Cloud Lightning
Intra-Cloud Lightning
Negative Lightning

9. Positive Lightning

12. The Sound of Thunder
Lightning heats up the air quickly (30,000 K) causing the air to rapidly expand.
This is the sound that we hear.

14. Lightning Videos
(slow motion)
(slow motion)
(upwa
lightning)

15. End of Notes
Alternative Pictures Follow