EESA06H3 Chapter 4: Chapter 4 Notes
Document Summary
the earth"s crust is a thin skin of rock. earth is divided into three major layers. The earth"s interior: the crust, the mantle, the core. seismic reflection and refraction suggest that the continents are largely igneous and metamorphic rock, such as granite and gneiss, overlain by a veneer of sedimentary rocks. geophysics the application of physical laws and principles to a study of the earth. occurs only if the velocity of seismic waves is different in each layer. it was the study of seismic refraction and seismic reflection that enabled scientists to plot the three main zones of the earth. makes up the plates of plate tectonics theory. because pressure increases with depth into the earth, the boundaries between mantle layers possibly represent depths at which pressure collapses the internal structure of certain minerals into denser minerals. seems to indicate that s waves do not travel through the core at all.
