A frozen lake is a body of water that has solidified due to low temperatures, creating a layer of ice on its surface. This phenomenon typically occurs in winter when air temperatures drop below freezing, allowing the water to freeze. The thickness of the ice can vary, depending on factors like temperature, water depth, and wind conditions. Frozen lakes can serve various purposes, such as recreational activities like ice skating, fishing, and snowmobiling. However, safety is crucial, as the ice may not be thick enough to support weight. Always check local guidelines and conditions before venturing onto a frozen lake.