Does lightning strike up or down?

Answer

Lightning occurs when a cloud builds up a partition of charge. The cloud facing the earth has a negative charge, while the top of the cloud ejects positive charges out and up into the upper atmosphere. So the cloud has all this additional electrical energy on the part facing the earth, and ultimately it dumps the energy down in the direction of the earth, which tends to have a positive charge compared to the cloud's underbelly.
Q&A Related to "Does lightning strike up or down?"
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