In summer, the overall temperature rises, the ice water on the surface will sink to the bottom of the lake, and the four degrees of water at the bottom will slowly float to the surface
By the time the overall temperature rises in summer, the surface of the ice water will sink to the bottom of the lake, and the water at the bottom of the lake will slowly float to the surface of the lake.
In summer, when the overall temperature rises, the surface ice water will sink to the bottom of the lake, and the water at the bottom of the lake will slowly float to the lake