[["The return stroke, which is the current that causes the visible flash, moves upward at a speed of about 320,000,000 feet per second or about 220,000,000 miles per hour. In comparison, the sound of thunder travels at about 1,100 feet per second or about 750 miles per hour.", 41.0], ["The return stroke, which is the current that causes the visible flash, moves upward at a speed of about 320,000,000 feet per second or about 220,000,000 miles per hour. In comparison, the sound of thunder travels at about 1,100 feet per second or about 750 miles per hour.", 19.0], ["Lightning is the flash of light that occurs when charge separation occurs. Like other forms of light, the light emitted from the lightning travels near the speed of light. This speed is near 300,000,000 meters per second.", 1.0]]
how fast does lightening go
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