A look at some of our favorite images of the week.
Lake Superior’s sea caves Mike Rundle, of Janesville, Wis, looks at ice formations in a sea cave at the Apostle Islands National Lakeshore of Lake Superior, near Cornucopia, Wis. According to the National Oceanic and Atmospheric Administration’s Great Lakes Environmental Research Laboratory, about 94 percent of Lake Superior is covered with ice, enabling people to visit the islands on foot for the first time since 2009. The Great Lakes, which contain one-fifth of the world’s surface fresh water, are 88 percent covered with ice. Buy Photo
View more photos of the sea caves. Eric Miller/Reuters