Material

Average Density (gm/cm³)

Average velocity (km/s)

Limestone

1.93 - 2.90

6.4

Dolomite

2.28 - 2.90

7.0

Sandstone

1.61 - 2.76

5.5

Shale

1.77 - 3.4

3.4

Oil

0.6 - 0.8

1.3

Gas (at 1 atm and 25˚C)

0.0008

0.33

Water

1.000

1.5