The coastline along Lake Superior is considered some of the most ... The rugged coastal areas have deposits of 2.5 billion year old granite, rock that can be used as a premium additive to asphalt ...

(The Minnesota Star Tribune) The latter quality is reinforced by Lake Superior green granite, a darker shade that's used on the base of the flagpole that is the centerpiece of the World War I ...

Lake Superior is known for its cool, blue beauty, but the largest freshwater lake in the world (by surface area) has a new antagonist: blue-green algae. The most recent bloom confirmed in the ...

The landing craft bounces over emerald water, jet-pumps humming, waves hitting a shore of jagged granite cloaked in ... horizon and ask the captain what Lake Superior is capable of.