The graph shown below illustrates the relationship between density and earthquake wave speed in different types of rock.
image f0b0243e0a644fef9964cf4852a2e0f4
A scientist detects an earthquake wave traveling at a speed of 6.5 km/s in rock with a density of 2.8 g/cubic cm. The scientists can BEST conclude that the wave is traveling through which type of rock?
A.
limestone
B.
shale
C.
anhydrite
D.
dolomite