Frozen Lake

Lake Thingvallavatn is shown amid a landscape of snowy mountains.

Lake Thingvallavatn in Iceland used to freeze solid in the winter. Now, it is beginning to thaw. (Axel Kristinsson/Creative Commons 2.0)

Dartmouth College
On March 9, 2017, a strange crack appeared on the ice-laden surface of Thingvallavatn, the largest lake in Iceland.
Lonely Lake
University of Wisconsin-Madison
The global warming is real. When you go to school near a lake that freezes during winter, the lake is your everyday's weather forecast and the best evidence of climate change.