A Soviet artist once drew a caricature about Eisenhower looking all over the Arctic for the Communist threat. But most experts agree that polar bears are the longest bears, as males may measure over 10 feet (3 meters) when standing on their hind legs. Glacial Striations - Grooves or scratches left behind in the bedrock after a glacier has passed over it. O gin ye were dead, gudeman, And a green turf on your head, gudeman! According to a new paper by Ott and Pickering in the Journal of Geophysical Research, each flash of lightning on average in the several mid-latitude and subtropical thunderstorms studied turned 7 kilograms (15.4 pounds) of nitrogen into chemically reactive NOx. "In other words, you could drive a new car across the United States more than 50 times and still produce less than half as much NOx as an average lightning flash," Ott estimated.

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