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This is an activity about shape. Learners will investigate that the Earth is a sphere by comparing the length of shadows from nails arranged on a flat map compared to nails arranged around a spherical globe. From the observations collected, they will infer that different shadow lengths at different locations would clearly indicate that our planet is not flat. This is Activity C-2 of Universe at Your Fingertips 2.0: A Collection of Activities and Resources for Teaching Astronomy DVD-ROM, which is available for purchase.
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