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When the entire lake reaches 40 F, the surface water cools further, dropping below 40 F. Because this water is now less dense than the surrounding water, it will stay on the top and continue to cool. Once the surface water falls to 32 F, it freezes. The freezing then spreads downward into the lake and the ice thickens
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The protection and restoration of the Chesapeake Bay and its streams and rivers are essential to a healthy and vibrant economy. The Bay provides countless opportunities and dollars in regards to its fishing, tourism, real estate, and shipping industries. Furthermore, working to restore this vital resource helps spur job growth and protect the countless livelihoods that depend on the Bay's health. Quite simply, failure to "Save the Bay™" threatens the Bay's value as an economic driver. Conversely, investing in clean-water technology creates jobs, generates economic activity, and saves money in the long run.
This is due to sahara desert and cold water current flowing on it
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More efficient use of agricultural land can boost crop yields and meet growing global demand for food. Smallholders have a vital role to play, both because they produce much of the world's food and because they represent a large share of the world's poor and food insecure.
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