The average density of Earth's crust $10 \ km$ beneath the surface is $2.7 \ g/cm^3$. The speed of longitudinal seismic waves at that depth is $5.4 \ km/s$. The bulk modulus of Earth's crust,considering its behavior as a fluid at that depth,is:
- A$7.9 \times 10^{10} \ Pa$
- B$5.6 \times 10^{10} \ Pa$
- C$7.9 \times 10^7 \ Pa$
- D$1.46 \times 10^7 \ Pa$
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