Internal Structure of the Earth and Plate Tectonics Division of Earth The internal structure of earth is divided into: (a) Crust (b) Mantle and (c) Core The division is based on physical and chemical properties, thickness, depth, density, seismic data, pressure-temperature and availability of metals. Ad: https://happyshirtsnp.com/ Types of Seismic Waves seismological data shows us that the earth has a layered structure. Seismic waves with varying velocities that depend on the type of wave and physical properties of medium for the wave travelling. Therefore, it is necessary to understand different types of waves. Wave type Description 1. Body wave (2 types) (a) Primary wave/ P-wave/Transverse wave (b) Secondary wave/Shear wave/Longitudinal wave Body waves travel through the body of the earth. The particles move forward and backward to the direction in which the wave is travelling. Can travel
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