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This is an activity about the discovery of water ice on Mars. Learners will create physical models using Earth samples to answer the question, "is it more likely that high altitude regions of Mars are composed of icy dirt (with ice filling the pore space of soils) or dirty ice (with dust sprinkled through a mostly icy surface)?" Included are teacher and student guides and a powerpoint with gamma ray spectrophotometric imagery of the North Arctic of Mars. This is the 3rd of 5 activities in Buried Water Ice on Mars.