Denver, Colorado has 850 miles of urban trails that are absolutely breath-taking to bike through. After Europeans, such as Sir Alexander Mackenzie , and Americans, such as the Lewis and Clark expedition , began exploring the range, minerals and furs drove the initial economic exploitation of the mountains, although the range itself never experienced a dense population. 14 Since the less dense continental crust “floats” on the denser mantle rocks beneath, the weight of any crustal material forced upward to form hills, plateaus or mountains must be balanced by the buoyancy force of a much greater volume forced downward into…