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IS THE GROUND WARMER OR COLDER THAN THE AIR? On a windless day, find a place in direct sunlight and drive a 6 foot stake in the ground there. On the shadow side of the stake, place a thermometer on the ground in such a way that the bulb is in direct contact with the ground. Place a second thermometer on the stake near the ground directly above the first thermometer. Attach a third thermometer at least 5 feet above the second. Be sure that each thermometer is on the shadow side of the stake so that it is not in the direct rays of the sun. Check the readings on the thermometers at 10-minute intervals. You will find that temperatures are higher nearer the ground. When cold air moves near the warm land or water, it becomes warmer and begins to rise. As the air rises, it becomes cooler and heavier, then moves down toward the land and water again. Why is this important? Why does anybody care if there is more heat close to the ground? Any problems with this page? Send URL to
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