WHY? These fans will twirl around in rising currents of warm air. These rising currents of warm air are called thermals and birds use thermals to extend their overall flying distance. Scientists have found that when the air runs into a tall structure, the thermals will run up along the side of the structure and go over the top of it. ASSESSMENT: Can the student communicate what they observed?

Student is able to communicate that the twirling motion of the fans was due to thermals. Student is able to communicate that the fan twirled due to the warm air current. Student is able to communicate that the fan twirled due to air. Student is only able to communicate that the fan moved.

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Last modified: Sun Aug 10 18:00:59 PDT 1997

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