Rocks are made in different ways, with sedimentary rocks being made from erosion and deposition of preexisting rocks, and metamorphic rocks being made when preexisting rocks melt and recrystallize. Find out how igneous rocks are made with help from a lab manager and research scientist in this free video on rocks.
About the Author
Jane Stammer is a lab manager and research scientist in the Advanced Mineralogy Research Center at the Colorado School Of Mines. Stammer has a master's degree in geology.