Scientists may have cracked the mystery behind one of North America’s most significant river systems, understanding how a river managed to cut through a Utah mountain range that’s been around for millions of years. The question of how the Green River, the largest tributary of the Colorado River, formed a canyon around 2,296 feet-deep through Utah’s 13,123 foot-high Uinta Mountains , instead of flowing around them, has perplexed geologists for more than a century and a half. What’s even more