What are the two types of Seismic ......

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Front (Question)

What are the two types of Seismic Waves, whats the differnce, and hows that help us learn about the core?

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Back (Answer)

P (pressure) waves:
longitudinal
propagate in solids & liquids
S (shear) waves:
transverse
propagate in solids only

Only P waves propagate through liquid outer core.
Both P & S waves propagate through solid mantle.
Extent of shadow zone gives size of outer core.
Solid inner core reflects some waves into shadow zone - Different refractive indexes

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