Only one guess from last week was correct -- they were two pictures taken on Stuart Glacier. I had the privilege to fly in a helicopter to the top of it, and immediately beneath my feet under a thin "crust", the glacial ice is deep blue! I was
fascinated!
The reason that the ice is so blue is that almost all of the air bubbles have been pressed out of the ice over time, so it's virtually like a crystal. It's much denser than the ice in your freezer. The reason it's blue is that the solid ice absorbs all of the other colors in the spectrum, but reflects the blue light.
The water melting at the top into beautiful little streams had a fantastic flavor, and you could drink it directly from the streams! On the ground, but especially in the air, you can see stripes on the glacier. This isn't only dirt, but mostly algae where we were walking around!