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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
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
Why is this important? Why does anybody care if there is
more heat close to the ground?
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