On the way back from Lake of the Woods, we stopped at a beautiful lake called Crater Lake. It was formed 7,700 years ago when Mount Mazama erupted and collapsed into itself. Its deepest point is 1,943 ft below the surface of the lake. Its astounding clarity is caused by the snow and rain falling into it, filling it with water. It is the clearest lake in the world, and the deepest in the U.S. There are two island in the lake, and also two cones (rising islands). It has set the world record for Secci readings, 143 feet. A Secci reading is very simple. Scientists slowly lower a black and white disk into the water. You measure how clear the lake is by how long you can see the disk. Here are some pictures that I took while I was there.
I love the intense blue coloring of it. The blueness of both the sky and Crater Lake is caused by the other wavelengths of the color spectrum being absorbed and the blue wavelength being scattered.