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Biology 7 Online
OpenStudy (anonymous):

1. Every year Eli and his family visit Great sand dunes desert in Colorado.Elliott notices that more dunes with varied shapes and sizes appear each year.Explain what causes phenomenon. 2. Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location.

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