Asia Nowak
Asia Nowak voted up Anonymous' answer

Above 40F warm water floats on cold water. Below 40F cold water floats on warm water. Every fall, lakes turn over, carrying oxygenated water to the bottom where fish will live while the surface freezes. In the spring the lakes turn over again, carrying food scraps to the surface to feed hatching insects. If not … Read more

Asia Nowak
Asia Nowak voted up Anonymous' answer

Above 40F warm water floats on cold water. Below 40F cold water floats on warm water. Every fall, lakes turn over, carrying oxygenated water to the bottom where fish will live while the surface freezes. In the spring the lakes turn over again, carrying food scraps to the surface to feed hatching insects. If not … Read more