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IS SOIL WARMER THAN WATER? Fill one coffee can with dry soil and another with water. Let each can remain in the classroom overnight so that they will be equal in temperature. Then put thermometers to the same depth in each can and place both cans outdoors in the sunlight. After two hours, check the temperatures to see which can is warmer and which is cooler. (The water should be cooler.) Describe experiences you have had walking barefoot from hot pavement or land to a puddle or from a sandy beach to the water. You should deduce that soil heats up more rapidly than water. Next set a can of soil and a can of water equal in tempera- ture in a refrigerator and check the temperatures every 10 minutes. You will find that the soil cools more quickly than the water. Such data can easily be graphed. Soil or water temperatures influence the air above them. That is, during the day land areas generally warm more rapidly than water areas; thus the air above the land tends to be heated and rise, while the cooler, heavier air over the water areas pushes inland to replace it. At night, the land areas generally cool more quickly, and the exchange of air is reversed. What does all this mean to people who live in a seaside town? What does it mean to people who live in the California Great Central Valley? What does it mean to people who live in Iowa?  Any problems with this page? Send URL to
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