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EARTH (LAYERS IF PHYSICAL
PROPERTIES (LITHOSPHERE- 100km thick( deeper…
EARTH
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Facts
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Density, pressure and temperature Increase with depth
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WEGENER
THEORY- Atlantic Ocean didn’t exist until Pangea broke apart. Continents and ocean floors are different
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MECHANISM- CONVECTION CURRENTS-carry moulting rock to the surface then spread it, pushing continents apart
SEISMIC WAVES- travel quicker through denser material , slower through hot areas, slower through liquid
BODY WAVES
P WAVES- fastest, can move through solid and liquid. Particles move in same direction as waves propagation. Compressional and longitudinal
S WAVES- Can only move through solid roc, particles move up and down or side to side . They are shear and transvible
SURFACE WAVES
LOVE WAVES- fastest surface wave, move the ground from side to side, confined to surface of the crust
REYLEIGH WAVES- roll along the ground and move it up and down and side to side in the same direction as wave propagation. Most shaking from an earthquake is due to this wave.
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MODIFIED MERCALLI SCALE- Rate intensity, recorded in Roman numerals
PLATE BOUNDARIES- CONVERGING, DIVERGING, TRANSFORMS