What is the interior structure of the Earth? We will start our

exploration of the Solar System with our home planet Earth. This

lecture discusses the interior structure of the Earth, introducing the

idea of differentiation, how geologists map the interior of the Earth

using seismic waves, and the origin of the Earth's magnetic field. I

describe the basic properties of the crust of the Earth, its division

into rigid tectonic plates, and describe how plate motions driven by

convection in the upper mantle have shaped the visible surface of our

planet over its dynamic history. Recorded 2007 Oct 30 in 1000 McPherson

Lab on the Columbus campus of The Ohio State University.