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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 Actividad 3.2 as part of El Universo a Sus Pies, a Spanish-language curriculum, available for purchase.