impervious [Adjective] + rock [Noun]

Strength Strength Dispersion
A:
3
CHISQ:
26.02
AWT:
29,412,538
TTEST:
1.57
G2:
13.72
FAWT:
1.85
MI:
3.4
LOGLOG:
5.39
JD:
0.43
MI3:
6.57
DICE:
0.06
RANGE: