What is a common sign of thin ice on frozen lakes and rivers?

Cracking sounds are a significant indicator of thin ice on frozen lakes and rivers. When ice is weak or starting to break, the stress of weight on the surface can lead to audible cracks or pops, signaling that the ice may not be safe to traverse. These sounds are a clear warning sign for individuals to reconsider venturing onto the ice, as they indicate instability and potential danger.

In contrast, while strong currents may affect ice thickness and formation, they are not a direct sign of thin ice at the surface. Snowy coverage may obscure the visual indicators of ice quality, and bright colors in ice can be a product of various environmental factors, including temperature and sunlight rather than a reliable signal of its strength. Therefore, the presence of cracking sounds serves as a more direct and recognizable warning about unsafe ice conditions.