A layered lake reveals how oxygen built up in our atmosphere billions of years ago

Little Deming Lake doesn’t get much notice from visitors to Itasca State Park in Minnesota. There’s better boating on nearby Lake Itasca, the headwaters of the Mississippi River. My colleagues and I need to maneuver hundreds of pounds of equipment down a hidden path made narrow by late-summer poison ivy to launch our rowboats.


Click here for original story, A layered lake reveals how oxygen built up in our atmosphere billions of years ago


Source: Phys.org