fault surface

13 LETTERS · STARTS WITH F

fault surface is a valid 13-letter word worth 20 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

F4A1U1L1T1S1U1R1F4A1C3E1

4 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 4 + 1 + 3 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does fault surface mean?