GEOL 1001 Chapter : Chapter 12
Document Summary
In all materials, p waves travel faster than do s waves: when seismic waves pass from one material to another, the path of the wave is refracted (bend) or reflected. Layers are defined by physical properties: with increasing depth, earth"s interior is characterized by general increases in temperature, pressure, and density, these all effect seismic wave velocity. Discovering earth"s major boundaries: the moho (mohorovicic discontinuity, separates crust from mantle. Identified y a change in the velocity of p waves. Larger than the planet mars began to form: earth"s dense central sphere, average density: 11 g/cm^3, two parts, outer core liquid, 2270 km thick. Inner core solid inner sphere, radius of 1216 km. Layers are defined by physical properties: outer core, composed of iron nickel alloy, convective flow generates earth"s magnetic field. Inner core: stronger than the outer core, behaves like a solid.
