1. Lightning

2. What causes lightning?
Lightning is caused by ice crystals crashing into each other
When the crystals break, they release energy in the form of electricity
If enough electricity builds up, large currents will move through the air
The arc of electricity is visible as lightning
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3. What is thunder? Thunder is caused by air movement after lightning
The electrical energy is turned into heat energy
When air is heated quickly by lightning, it expands
The moving air creates a massive sound wave
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4. Facts about lightning
Sound travels about one kilometers every three seconds
For every three seconds you count before hearing thunder, a lightning strike is one kilometer away
The electricity of one lightning strike is brighter than ten-million 100-watt lightbulbs
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5. Facts about lightning
Between 350 to 600 people are struck by lightning in the United States every year, around 70 people are killed
If possible, get inside well before a thunderstorm arrives, because lightning can travel great distances
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