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Students can review stratigraphic concepts such as original horizontality and superposition. The white layers are pure snow, the tan layers are a mixture of gravel, sand, salt, clay and snow. Dark layers are clay-sand-rich, wet with water from melting snow (salt has caused the snow to melt). The Journal of Geoscience Education article Fourth Grade Students Investigate Stratigraphy through Experiments and Photographs of Snow Layers provides an example of how this was used in the classroom.
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