According to freetech4teachers.com, the BBC's Rocks and Weathering, "illustrates and explains how sedimentary, igneous, and metamorphic rocks form. In each stage of the site, students can "create" rocks and "inspect" rocks with a virtual magnifying glass. Students "create" rocks by compacting sediment or by adding water to cool lava. After creating rocks, students can then "destroy" rocks by adding elements of weather." Click here to explore.
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