Final answer:
The vertical extent of the taliks found under lakes is related to seasonal temperature changes, such as the spring turnover.
Step-by-step explanation:
The vertical extent of the taliks found under lakes is related to the seasonal changes in temperature. In springtime, as the surface water temperature approaches 4 °C, it becomes heavier and sinks to the bottom, displacing the water at the bottom of the lake and causing it to rise to the top.
This process, known as the spring turnover, brings along sediments and nutrients from the lake bottom. During the summer months, the lake water stratifies into layers, with the warmest water at the surface.