The Standard Deviants explore volcanoes and what causes them to erupt. We'll discuss lava, pyroclastic materials, and the infamous Ring of Fire. Then it's time for weathering and erosion, including the different types of physical weathering processes, like frost wedging, exfoliation and thermal expansion, and the thrills and chills of chemical weathering.

Co-written by Janet Herman, Ph.D. of University of Virginia and Richard Diecchio, Ph.D. of George Mason University.