| Answer | Crossword Clue |
|---|---|
| craton | relatively rigid and immobile region of continental portions of the earth's crust |
| sials | the assemblage of rocks, rich in silica and alumina, that comprise the continental portions of the upper layer of the earth's crust |
| sial | the assemblage of rocks, rich in silica and alumina, that comprise the continental portions of the upper layer of the earth's crust |
| sialic | the assemblage of rocks, rich in silica and alumina, that comprise the continental portions of the upper layer of the earth's crust |
