| Answer | Crossword Clue |
|---|---|
| CAKING | Forming a crust |
| scabbed | crust forming over a sore |
| crustose | forming a thin brittle crust |
| scab | crust forming over a sore |
| cratons | A large, stable block of the earth's crust forming the nucleus of a continent |
| silicates | Any of the many minerals consisting primarily of SiO42? combined with metal ions, forming a major component of the rocks of the earth's crust |
| SIAL | Crust-forming rock |
