American Robin
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Challenge question #2

Dalton School (daltonschool@wycol.com)
Wed, 25 Feb 1998 10:54:09 -0800

This question was very difficult for my second grade class. Explaining
isotherms was very challenging in itself. However, we did come to the
conclusion that an isotherm of 36 degrees would allow the snow to melt
and the ground to warm up, inviting the robins to search for food.