“Lake Superior, they say, never gives up her dead, when the winds of November blow early.” – Gordon Lightfoot
Superior is quite different from the other Great Lakes. For one thing it does not sit on that hard dolostone basin I described earlier. Its local geology allowed the ice sheet of the last glacial maximum to scour out Superior to a depth of 1,300 feet, making it by far the deepest of the Great lakes. In fact, the bottom of Superior is the lowest point of the North American continent.
The five Great Lakes contain 20% of all the (unfrozen) fresh water in the world. So it’s probably a really a good idea to keep the Lakes clean.
A number of years ago environmentalists began running around like chickens bereft of their heads. They ran to the nearest microphones they could find to announce the demise of the Great Lakes due to global climate warming change. The proof was right there. The water levels of the Great Lakes was decreasing. Scientists swarmed over the Lakes to document the evidence that would forever drive the final nail into the pitiful arguments of the “deniers.”
After a year or so of study the scientists quietly published the results of their investigation. The top of the water wasn’t going down – the bottom of the Lakes was going UP! It’s called crustal rebound. During the last glacial maximum of the ice age there was a sheet of ice on the the North American continent that was more than a mile thick. The weight of all that ice depressed the earth’s crust, including the area of the Great Lakes. For the last 9,000 years since that ice melted the crust has been rebounding – as much as 1,800 feet in some places. If fact, the Toronto CN Tower appears to be getting higher every year. The land it sits on is rising one inch each year.
A day or two ago I pointed out that Lakes Huron, Michigan and Erie set on a large circular basin of dolostone rock which is very hard and impervious to water. That basin extends all the way from Lake Erie to the place where Niagara Falls was originally located. While the water going over the Falls does not wear the dolostone, it does wear the limestone rock that underlies the dolostone and as the limestone base is undercut it creates a dolostone shelf or overhang. Eventually the weight of that overhanging dolostone will snap it off. This process causes the Falls to back up toward Lake Erie at a rate of 3 feet per year. In about 21,000 years the Falls will retreat the 12 miles to Lake Erie and when that happens all of the Lakes will drain out to a new level 180 feet lower than they currently are. (The height of the Falls.)
OK, I’ve got BIG news! A few nights ago I was kidnapped by space aliens. I was walking in the wooded area beside my property and I was surrounded by brilliant flashing lights of many colors. Then I heard this weird noise like, “Woo woo, woo, woo. I felt myself being pulled up into the flashing light. I kind of blacked out for a moment and when I came to my senses I was in a big room with glowing walls and I was surrounded by these little gray humanoids. They made these odd noises that I think was some kind of verbal communication which I could not understand at all
After a minute or so one of them pointed at me and I began to float through the air and into a large transparent restraint cell and I was hermetically sealed inside of it. In the cell with me were several smaller containers. Some contained water and others contained what I assumed to be food. There was also a small device that began speaking in an automated voice. The voice said I was being taken to the planet Tupper to be studied, but I would not be harmed. And then, it said I would be returned to Earth. When we arrived at Tupper they did all kinds of tests on me. Some were a little uncomfortable, but no more than getting a needle.
After what seemed like at least a day, I was once again hermetically sealed in my cell and transported back onto the space ship and brought back to Earth. I was released in the very spot from which I was taken. I hurried into the house and discovered I had been gone for exactly 48 hours. Thanks to the hermetic sealing, though, I felt remarkably fresh.
With savages the weak in body or mind are soon eliminated. We civilized men, on the other hand, do our utmost to check the process of elimination. We build asylums for the imbecile, the maimed and the sick. Thus the weak members of civilized societies propagate their kind. No one who has attended to the breeding of domestic animals will doubt that this must be highly injurious to the race of man. Hardly anyone is so ignorant as to allow his worst animals to breed.
The Descent of Man