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This photograph shows the Sojourner rover and the rock Yogi. Notice the red tone of the soil on Mars. The soil of Mars contains minerals rich in the element iron.
Courtesy JPL/NASA

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF