What causes lightning?
Scientists find clues to the mystery of what causes lightning | Geology IN
Geology IN: Scientists find clues to the mystery of what causes lightning
What Causes Lightning
What Causes Lightning? | Wonderopolis
What Causes Lightning? | eHow
What Causes Lightning?
Universe Today Astronomy Photo Pool
Weather & Geoscience
What Causes Upside-Down Lightning? Electricity can travel from ground-to-cloud, too -- and the effects can be damaging. Continue reading →
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