Discussion
The S-wave that is reflected from the outer core is denoted as :
Answer: C
The S wave reflected from the outer core is ScS.
In seismic phase notation, S is a shear wave in the mantle and a lower-case c marks a reflection from the core-mantle boundary, the top of the outer core. So ScS is an S wave that travels down through the mantle, reflects off the outer core and returns as an S wave. PcP is the equivalent compressional phase.
SKP is an S wave that converts to a P wave (K) in the liquid outer core and emerges as a P wave; it passes through the core rather than reflecting from it. 'SOcS' and 'ScOS' are not standard phase names.
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