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Name: Maryjane
Status: other
Grade: 12+
Location: Outside U.S.
Country: USA
Date: Summer 2009

Question:
Ihave a small tree limb (branch)which moves up and down with a weather change-it is very accurate-what tree is it and how does it work?



Replies:
Possibly related to changes in barometric pressure and temperature:

http://www.newton.dep.anl.gov/askasci/wea00/wea00073.htm

Similar to the leaf turning question with weather changes:

http://www.newton.dep.anl.gov/askasci/gen06/gen06112.htm

http://answers.yahoo.com/question/index?qid=20060709141138AAqFfj9

Sincerely,

Anthony R. Brach, PhD
Missouri Botanical Garden



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