USA Today had a nice piece on earthquake lights, a rare but natural phenomenon commonly misidentified as UFOs. Check it out! (Image is from the article).
"When a powerful seismic wave runs through the ground and hits a layer of such rocks, it compresses the rocks with great pressure and speed, creating conditions under which large amounts of positive and negative electrical charges are generated," he said. These charges can travel together, reaching what's called a plasma state, which can burst out and shoot up into the air.
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