An ice wedge is a type of ground feature formed in permafrost regions, where the ground freezes and thaws repeatedly. During the winter, water seeps into cracks in the frozen ground and freezes, expanding and creating a wedge-shaped crack. Over time, these ice wedges can grow larger as more water fills the cracks and freezes. Ice wedges are commonly found in areas like the Arctic and Antarctic, where extreme cold conditions prevail. They can be several meters deep and wide, contributing to the unique landscape of tundra environments. These features are important for understanding climate change and permafrost dynamics.