The three types of rocks are igneous, formed from molten rock, sedimentary, formed from the elements of an existing rock, and metamorphic, formed by a change in heat or pressure. Identify the three different types of rocks with information from a geology professor in this free video on rocks. Expert: Jeffrey K. Wagner Bio: Jeffrey K. Wagner is an associate professor of astronomy and geology. He has been a faculty member of Bowling Green State University Firelands since 1981. Filmmaker: Bradley Walton
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